Tag Archives: Denver weather

November 23 to November 29: This Week in Denver Weather History

This Week in Denver Weather History

In our look back at this week in Denver weather history one theme seems to recur more than any other: wind. Powerful wind events dominate the notable events with many causing significant damage.

From the National Weather Service:

21-23

In 1918…post-frontal snowfall totaled 5.9 inches in downtown Denver. Most of the snow…5.3 inches…fell on the 22nd. North winds were sustained to 20 mph on the 21st.

In 1931…a major storm dumped a total of 13.2 inches of snowfall over downtown Denver. Most of the snow…11.4 inches…fell on the 21st. A very cold air mass settled over the city after the heavy snow on the 21st. After a low temperature of zero…the temperature climbed to a high of only 5 degrees on the 22nd…a record low maximum for the date.

21-25

In 1952…snowfall of 6.2 inches was measured at Stapleton Airport where northeast winds gusted to 17 mph on the 21st.

22-23

In 1953…strong winds raked Boulder causing 18 thousand dollars in damage. Wind gusts to 80 mph were recorded at Valmont and estimated to 80 mph at the Boulder airport.

23

In 1899…a trace of snow fell in the city. This…together with a trace of precipitation on the 16th and 21st…was the only precipitation of the month…making the month the driest on record. The record was equaled in November of 1901 and 1949. This trace of snow along with a trace of snow on the 21st was the only snow of the month…ranking the month the 2nd least snowiest on record. This record was equaled in November of 1884…1901…1905…1917…and 1939.

In 1901…northwest winds were sustained to 45 mph with gusts to 53 mph. The Chinook winds warmed the temperature to a high of 70 degrees.

In 1910…west winds were sustained to 42 mph. The Chinook winds warmed the temperature to a high of 67 degrees.

In 1959…west-northwest winds gusted to 56 mph…briefly reducing the visibility to 3 miles in blowing dust at Stapleton Airport.

In 1998…winds…estimated as high as 58 mph…caused several wood trusses installed in a police station under construction in Castle Rock to collapse. A construction worker on the roof received minor injuries when he was struck by one of the trusses. Southeast winds gusted to 38 mph at Denver International Airport.

23-24

In 1992…a pre-Thanksgiving blizzard belted metro Denver. Gusty north to northeast winds at 30 to 40 mph caused near-whiteout conditions as visibilities were often below 1/4 mile. The strong winds drove snow into drifts of more than 4 feet. Hundreds of holiday travelers were stranded when airlines canceled flights at Stapleton International Airport where snowfall totaled 7.6 inches and north winds gusted to 37 mph. Blizzard conditions began around mid- morning on the 23rd and ended by mid-afternoon…but heavy snow fell through the night. Snowfall totaled: 12 inches at Conifer…Morrison…and Wheat Ridge; 19 inches at Littleton; 16 inches at Castle Rock; 9 inches in Brighton; 8 inches in Aurora; and 6 inches in Parker.

In 1993…a moist upper level disturbance dumped heavy snow over most of Colorado. Snowfall amounts averaged 5 to 8 inches across metro Denver. Snowfall totaled 4.6 inches at Stapleton International Airport where northeast winds gusted to only 20 mph on the 23rd. The very cold air mass caused the temperature to dip to a record low of 8 degrees below zero on the 24th. The temperature that day climbed to only 9 degrees…also setting a record low maximum for the date.

24

In 1915…Chinook winds from the southwest sustained to 40 mph with gusts to 46 mph warmed the temperature to a high of 61 degrees. It was windy most of the day.

In 1949…the low temperature dipped to 56 degrees…the all-time record highest minimum temperature ever recorded during the month of November.

In 1960…violent wind gusts caused some damage in Boulder. West winds gusted to only 22 mph at Stapleton Airport.

In 1980…a snow storm brought 3 to 6 inches of snow across metro Denver. At Stapleton International Airport…only 2.1 inches of snow fell.

In 1989…high winds were recorded in Boulder with a gust to 64 mph. West winds gusted to only 24 mph at Stapleton International Airport.

24-25

In 1908…heavy snowfall totaled 7.0 inches over downtown Denver overnight. North winds were sustained to 15 mph.

In 1930 strong winds raked the Front Range eastern foothills. Winds gusted to 40 mph at Valmont just east of Boulder where minor damage occurred.

In 1970…strong Chinook winds warmed Boulder. At the National Center for Atmospheric Research in Boulder…wind gusts reached 97 mph…while in downtown Boulder winds peaked to 69 mph. Some minor damage occurred. Northwest winds gusted to 39 mph at Stapleton International Airport…and the high temperature warmed to 76 degrees on the 25th…setting a new record maximum for the date.

25

In 1877…northwest winds were sustained to 50 mph.

In 1902…northwest winds were sustained to 45 mph with gusts to 48 mph. The strong apparent bora winds warmed the temperature to a high of only 45 degrees.

In 1943…snowfall of 4.0 inches was the only measurable snow of the month. North winds were sustained to 17 mph.

In 1958…strong pre-frontal Chinook winds struck Boulder and the eastern foothills. A wind gust to 100 mph was recorded northwest of Denver. A gust to 88 mph occurred at Rocky Flats south of Boulder. The windstorm caused considerable structural damage to residential sections of north metro Denver.

In 1959…strong winds raked the eastern foothills including Boulder and Eldorado Springs. Wind gusts to 100 mph were estimated at the Matterhorn restaurant located atop Rocky Flats south of Boulder.

In 1993…a wind gust to 99 mph was recorded atop Squaw Mountain near Idaho Springs.

In 1998…strong winds developed over portions of the Front Range foothills for a brief time following the passage of a weak upper level disturbance. A wind gust to 71 mph was measured atop Blue Mountain near Coal Creek Canyon.

In 1999…strong Chinook winds developed in and near the foothills. Peak wind reports included 100 mph at the Eldora ski resort and 77 mph at the National Center for Atmospheric Research mesa lab above Boulder. West winds gusted to 38 mph at Denver International Airport.

In 2010…high winds developed in the foothills of Boulder County. A gust to 75 mph occurred 5 miles northwest of Boulder with a gust to 72 mph at the National Center for Atmospheric Research mesa lab above Boulder. West winds gusted to 24 mph at Denver International Airport.

Continue reading November 23 to November 29: This Week in Denver Weather History

November 16 to November 22: This Week in Denver Weather History

This Week in Denver Weather History

Snow certainly is common this time of year and we see many notable events featuring the white stuff in our look back at this week in Denver weather history. More prevalent however are significant wind events.

From the National Weather Service:

14-18

In 1964…the first measurable snowfall of the season totaled 6.0 inches at Stapleton International Airport where northeast winds gusted to 32 mph on the 14th. Most of the snow…4.2 inches…fell on the 14th. This was the only measurable snow of the month.

15-16

In 1894…winds behind an apparent strong cold front were sustained to 60 mph with gusts to 75 mph on the 15th. Snowfall totaled 2.6 inches in the city. Temperatures plunged from a high of 72 degrees on the 15th to a low of only 5 degrees on the 16th. The high temperature on the 16th was 24 degrees…which occurred shortly after midnight.

In 1996…around a foot of new snow fell in the foothills west of Denver with 3 to 6 inches at lower elevations across metro Denver. Some of the snowfall totals included: 15 inches at Georgetown…12 inches at Idaho Springs…10 inches at Chief Hosa…and 9 inches in Coal Creek Canyon. Snowfall totaled 2.9 inches at the site of the former Stapleton International Airport. Northeast winds gusted to 23 mph at Denver International Airport on the 16th.

15-17

In 1991…a strong winter storm dumped heavy snow over metro Denver. Snowfall amounts totaled 15 inches at Castle Rock and Conifer…14 inches at Morrison and Parker…12 inches in southeast Aurora…and 11.6 inches at Stapleton International Airport. Winds were light with the storm.
16

In 1899…a trace of rain fell in the city. This…together with a trace of precipitation on the 21st and 23rd…was the only precipitation of the month…making the month the driest on record. The record was equaled in November of 1901 and 1949.

In 1926…rain changed to snow behind a cold front and totaled 2.0 inches. North winds were sustained to 48 mph with gusts as high as 54 mph.

In 1930…strong winds occurred in Boulder causing minor damage. At Valmont just east of Boulder…winds gusted to 52 mph. West winds were sustained to 37 mph with gusts to 46 mph in downtown Denver.

In 1948…a west-northwest wind gust to 50 mph was recorded at Stapleton Airport.

16-17

In 2010…the combination of heavy snow and strong winds produced dangerous driving conditions in the high country. Blizzard conditions forced the closure of U.S. Highway 6 at Loveland pass and U.S. Highway 40 at Berthoud Pass. Blowing and drifting snow forced the closure of a 65-mile stretch of Interstate 70…west of Idaho Springs. Peak wind gusts included: 68 mph atop Niwot Ridge…55 mph near Blackhawk and Gunsight…and 52 mph at Berthoud Pass. Storm totals in the ski areas west of Denver ranged from 12 to 21 inches. Northwest winds gusted to 55 mph at Denver International Airport on the 16th.

16-18

In 1921…heavy snowfall totaled 6.5 inches over downtown Denver. This was the only measurable snow of the month. East winds were sustained to 14 mph on the 17th.

17

In 1948…a dry vigorous cold front accompanied by north winds gusting to 60 mph produced extensive blowing dust…which briefly reduced the visibility to 1/2 mile at Stapleton Airport.

In 1993…a wind gust to 70 mph was recorded atop Squaw Mountain near Idaho Springs.

In 1994…winds gusted to 66 mph in Boulder and to 63 mph on Rocky Flats south of Boulder. West winds gusted to 49 mph at Stapleton International Airport.

In 2000…snow fell in the foothills west of Denver…mainly south of the I-70 corridor. Snowfall totals included: 8.5 inches…7 miles south of Tiny Town; 6 inches at Genesee; and 5 inches…11 miles southwest of Morrison. Only a trace of snow was recorded at the site of the former Stapleton International Airport.

In 2016…bands of moderate to heavy snow fell along the Interstate 70 Corridor as strong fast moving storm system moved across Colorado. Wet roads quickly became icy and snowpacked. A 20-vehicle crash involving semis kept both directions of I-70 closed near Evergreen for a couple of hours. Storm totals included: 11.5 inches…4.5 miles south-southeast of Idaho Springs; 8 inches…5 miles west of Evergreen; 7.5 inches near Conifer…with 4 to 7 inches elsewhere. At Denver International Airport…1.7 inches of snowfall was observed.

17-18

In 1869…the heaviest wind storm in 5 or 6 years raked the eastern foothills including Boulder…Denver…Georgetown… And Golden. Some hundreds of dollars in damage occurred in Boulder.

In 2022…heavy snow developed in and near the foothills of Boulder and northern Jefferson counties…where storm totals ranged from 6 to 12 inches of snowfall. Periods of light to moderate snowfall occurred elsewhere. In Denver and the surrounding suburbs…storm totals included: 12 inches near Golden and west Boulder…10.9 inches…3.5 miles west-northwest of Arvada; 8 inches in Lakewood…6 inches at Ken Caryl and Wheat Ridge…with 3.8 inches at Denver International Airport.

18

In 1872…fresh west winds contributed to the relative humidity dipping to zero at 2:43 pm. The maximum temperature was 54 degrees.

In 1907…heavy snowfall totaled 6.0 inches over downtown Denver. Snow fell all day. North winds were sustained to 19 mph.

In 1915…northwest winds were sustained to 42 mph with gusts as high as 48 mph. It was windy most of the day.

In 1996…high winds struck the foothills west of Denver. Wind gusts ranged from 70 to 75 mph. A few power lines were downed…but no major outages were reported.

In 1998…strong downslope winds developed during the morning. Wind gusts reached a peak of 72 mph at Jefferson County Airport near Broomfield. West winds gusted to 41 mph at Denver International Airport.

In 1999…high winds developed in and near the Front Range foothills. The strong winds downed power lines…which sparked several small brush fires. In Broomfield… Scaffolding was damaged at the Wadsworth Recreation Center…while flying rocks broke several windows at a local bank building. Peak wind gusts included: 91 mph atop Blue Mountain near Wondervu…88 mph atop the Gamow Tower on the University of Colorado campus in Boulder… 83 mph at Jefferson County Airport…81 mph at the National Center for Atmospheric Research mesa lab above Boulder…and 80 mph at Wondervu. West-northwest winds gusted to 48 mph at Denver International Airport.

Continue reading November 16 to November 22: This Week in Denver Weather History

November 9 to November 15: This Week in Denver Weather History

This Week in Denver Weather History

As we ready for a major change from above normal temperatures to bitter cold, our look back at this week in Denver weather history shows that extreme weather this time of year is not particularly unusual.

From the National Weather Service:

8-9

In 1897…west winds were sustained to 45 mph with gusts as high as 50 mph in the city.

In 1919…post-frontal heavy snowfall totaled 8.4 inches over downtown Denver. Most of the snow…6.6 inches…fell on the 9th. North winds were sustained to 26 mph with gusts to 30 mph on the 8th.

In 1950…a major winter storm dumped 10.4 inches of snow at Stapleton Airport with the most snow…7.8 inches…falling on the 8th. East winds gusted to 31 mph at Stapleton Airport on the 8th. Snowfall totaled 8.2 inches in downtown Denver.

In 1958…strong winds caused some damage in Boulder. West- northwest winds gusted to 40 mph at Stapleton Airport on the 8th.

In 1975…heavy snowfall hit metro Denver. Snowfall at Stapleton International Airport totaled 8.0 inches and east winds gusted to 21 mph. Power outages caused by the storm affected over 10 thousand people in metro Denver. In the foothills west of Denver…10 to 15 inches of snow fell. The storm produced the greatest 24-hour precipitation…1.29 inches…ever recorded during the month of November in the city.

In 1983…metro Denver received 4 to 8 inches of snow with the heaviest amounts near the foothills. It was the first measurable snow of the season in Denver. Only 1.8 inches of snow fell at Stapleton International Airport where north winds gusted to 20 mph.

In 1989…strong winds hit the Front Range. On the 9th…the wooden frame of a house under construction in Boulder was blown down. The previous evening a power outage blackened Nederland. Wind gusts to 95 mph were recorded 4 miles south of Rollinsville with 97 mph on Fritz Peak near that town. At Stapleton International Airport…northwest winds gusted to 45 mph on the 8th and to 38 mph on the 9th.

In 1998…another upslope snow event developed in the Front Range foothills. The heaviest snowfall occurred in west central Jefferson County where 14 inches were measured 8 miles west of Conifer. Other snowfall totals included: 10 inches at Evergreen and 9 miles northwest of Bergen Park; 9 inches at Genesee…Nederland…and near the Chief Hosa exit on I-70; and 8 inches in Coal Creek Canyon. On the 9th…snowfall was 2.6 inches at the site of the former Stapleton International Airport. North-northeast winds gusted to 30 mph at Denver International Airport on the 9th.

8-10

In 1985…Indian summer came to an abrupt end when a winter storm dumped 10 to 18 inches of snow in the Front Range foothills and 6 to 10 inches across metro Denver…snarling traffic and causing flight delays of up to 3 hours at Stapleton International Airport. The temperature plunged from a high of 66 degrees on the 8th to a low of only 13 degrees on the 9th…after the passage of a vigorous cold front with northeast winds gusting to 32 mph. The temperature climbed to only 19 degrees on the 10th…setting a record low maximum for the date. Snowfall totaled 7.3 inches at Stapleton International Airport with most of the snow…7.1 inches…falling on the 9th.

9

In 1939…a trace of snow fell over downtown Denver. This snow…along with a trace of snow on the 2nd…was the only snow of the month…ranking it…along with other months…the second least snowiest November on record. Precipitation of 0.01 inch was the only precipitation of the month…making this the second driest November on record.

In 1944…the first killing frost of the season occurred in the city when the low temperature dipped to 35 degrees. This is the latest date for a killing frost ever recorded in Denver.

In 1946…heavy snowfall totaled 7.7 inches over downtown Denver. This was the second heavy snowfall in less than a week. Northwest winds were sustained to 26 mph.

In 1995…strong downslope winds gusted between 50 and 57 mph at Erie and Boulder. West wind gusts to 44 mph were recorded at Denver International Airport.

In 2014…a record high min of 45 degrees…broke the previous record of 43 degrees set in 1934…and preceded several days of record cold temperatures from the 11th through the 13th.

10

In 1897…west Chinook winds sustained to 51 mph with gusts to 60 mph warmed the temperature to a high of 64 degrees.

In 1915…southwest winds were sustained to 41 mph with gusts as high as 44 mph.

In 1955…strong winds raked the eastern foothills. A wind gust to 80 mph was recorded atop Rocky Flats south of Boulder where some damage occurred.

In 1995…snowfall totaled 6 to 9 inches in the foothills west of Denver…while only 2.2 inches of snow fell at the site of the former Stapleton International Airport. North-northeast winds gusted to 31 mph at Denver International Airport.

In 1998…strong bora winds gusting from 70 to 92 mph coupled with blowing snow created whiteout and slick black ice conditions at the base of the foothills west of Denver. State Highway 93 between Golden and Boulder and C-470… Near the Morrison interchange were closed for several hours due to multiple car accidents. Dozens of motorists were stranded until weather conditions improved. A small motor home was a total loss when it caught fire after being blown on its side by strong crosswinds. A man was injured when he was blown off a vehicle while attempting to rescue the occupants. Wind gusts included: 92 mph atop Blue Mountain near Coal Creek Canyon…83 mph atop Fritz Peak near Rollinsville…and 77 mph at Jefferson County Airport near Broomfield. West winds gusted to 36 mph at Denver International Airport.

In 2000…freezing drizzle was widespread across northeastern Colorado with the heaviest amounts near the foothills in the evening. The freezing drizzle made many highways icy and slick…which contributed to a number of traffic accidents. Some highways across metro Denver were closed at times…including portions of State Highway 119 between Boulder and Longmont and U.S. 36 between Westminster and Boulder. State Highway 93 between Boulder and Golden atop Rocky Flats became nearly impassable due to a coating of ice by late evening.

Continue reading November 9 to November 15: This Week in Denver Weather History

November 2 to November 8: This Week in Denver Weather History

This Week in Denver Weather History

Snow and wind are recurring themes in our look back at this week in Denver weather history. Among the more notable events are a four-day snowstorm in 1946 that dumped an astounding 31 inches of snow on the city.

From the National Weather Service:

1-2

In 1892…snowfall totaled 5.0 inches in downtown Denver. This was the only snow of the month.

In 1956…heavy snowfall totaled 7.0 inches at Stapleton Airport. The storm was accompanied by much blowing and drifting snow. North winds gusted to 47 mph.

In 1991…the storm system which hit the Front Range at the end of October finished the job during the start of November. Six inches of new snow were recorded at both Rollinsville and Morrison…while 2.9 inches of snow fell at Stapleton International Airport where northeast winds gusted to 17 mph. The temperature climbed to a high of only 19 degrees on the 2nd…setting a record low maximum for the date.

In 1995…a winter storm dropped 5 to 8 inches of snow in the Front Range foothills. The exception was at Golden Gate Canyon where a foot of new snow was measured. Icy roads…fog…and blowing snow along I-70 in the foothills west of Denver caused dozens of accidents. One man was killed when he lost control of his vehicle and was ejected when his truck hit a median and rolled over. At least 20 other accidents involved minor injuries. Only 1.0 inch of snow fell at the site of the former Stapleton International Airport where some freezing rain also fell.

2

In 1939…a trace of snow fell over downtown Denver. This snow…along with a trace of snow on the 9th…was the only snow of the month…ranking it…along with other months…the second least snowiest November on record.

In 1967…post-cold frontal heavy snowfall totaled 6.2 inches at Stapleton International Airport where north winds gusted to 29 mph…briefly reducing the visibility to 1/8 mile.

In 1992…the first major snowfall of the season dumped 4.6 inches of snow at Stapleton International Airport where north winds gusted to 26 mph. Heavier amounts of snow fell in and near the foothills with 8 inches at Conifer… Empire…and Bailey…6 inches at Rollinsville and Golden Gate Canyon…and 4 inches at Morrison and Wheat Ridge.

In 2011…a storm system brought another around of moderate to heavy snow to the region. Areas in and near the Front Range foothills and Palmer Divide were hit the hardest. Gusty winds also produced blizzard conditions at times along the Palmer Divide. In addition…the snow and blowing snow forced several school closures in Douglas and Weld counties. Snow drifts…from 1 to 3 feet deep were reported in the northern portion of Douglas and Elbert counties. Storm totals included: 14 inches…4 miles south of Boulder and 12.5 miles northwest of Golden…13 inches… 5 miles east-southeast of Aspen Springs; 12 inches near Allenspark and Parker; 11 inches…6 miles southwest of Castle Rock…Genesee…9 miles north-northeast of Elizabeth…10 inches…10 miles south-southeast of Buckley AFB. At the National Weather Service in Boulder… 7.9 inches of snow was recorded…with 4.5 inches observed at Denver International Airport.

2-3

In 1974…heavy snowfall totaled 6.1 inches at Stapleton International Airport where north winds gusted to 23 mph on the 3rd. Most of the snow fell on the 3rd. Maximum snow depth on the ground was 5 inches.

In 1990…a winter storm dumped 3 to 8 inches of heavy wet snow across metro Denver. In the foothills snow amounts ranged from 4 to 10 inches. Slushy snow and ice-covered roads snarled traffic. The snow…ice…and poor visibilities were blamed for numerous traffic accidents. Low clouds… Fog…and snow delayed air traffic at Stapleton International Airport for at least 90 minutes on the afternoon of the 2nd. Snowfall totaled 5.4 inches at Stapleton International Airport where north winds gusted to 21 mph.

In 2018…a powerful and moist Pacific jet stream brought a period of moderate to heavy snow and blowing snow to the mountains west of Denver with up to a foot of snow. A strong gust front generated from dissipating showers near the foothills of southeast Larimer and eastern Boulder counties pushed across the I-25 corridor and adjacent plains. As the gust front swept across Denver International Airport…a peak wind gust to 58 mph was observed from the west-northwest.

2-5

In 1946…a major snow storm dumped 30.4 inches of heavy snowfall downtown and 31.0 inches at Stapleton Airport. The winter storm closed schools and disrupted all forms of transportation in the city. The greatest depth of snow on the ground was 28 inches at the airport. The duration of the snowfall…from 4:22 am on the 2nd to 3:08 am on the 5th… A total of 70 hours and 46 minutes…is the second longest period of continuous precipitation on record and the second heaviest snowfall of record at the time in Denver. The 17.7 inches of snowfall on the 2nd and 3rd was the greatest 24- hour snowfall ever recorded during the month of November. Buses and street cars had a difficult time…and many cars were abandoned along roadsides and streets for several days. Secondary roads in rural areas were blocked for 2 to 3 weeks. Several buildings in the city collapsed or were damaged from the weight of the heavy snow. Football games were canceled. Livestock losses were high over eastern Colorado. The precipitation from this storm alone exceeded the greatest amount ever recorded in Denver during the entire month of November previously. The precipitation recorded downtown was 2.03 inches…and the previous record for the entire month of November was 1.95 inches in 1922. North winds were sustained to 26 mph on the 2nd.

3

In 1940…the longest period without snow…200 days…ended on this date with the first snow of the season…a trace…on November 4…1940. The last snow of the previous season… Also a trace…occurred on April 17…1940.

In 1959…a rare thunderstorm in November occurred around sunrise. Rainfall measured only 0.02 inch at Stapleton Airport.

In 1993…periodic high winds buffeted the foothills west of Denver. Wind gusts to 90 mph were recorded at Rollinsville in the foothills southwest of Boulder…while gusts to 85 mph were observed atop Squaw Mountain near Idaho Springs. West winds gusted to 37 mph at Stapleton International Airport.

In 1996…a rare November thunderstorm during the early evening produced 0.10 inch of rain at Denver International Airport and only 0.06 inch of rain at the site of the former Stapleton International Airport.

In 2005…strong winds developed over the urban corridor. While the damaging winds were in the Fort Collins area… High winds also developed to the south of Denver in Douglas County. Peak wind reports included 70 mph at Franktown…65 mph in Castle Rock…and 61 mph in Sedalia. West winds gusting as high as 47 mph warmed the temperature to a high of 69 degrees at Denver International Airport. Winds were strong and gusty for most of the daytime hours across metro Denver.

3-4

In 1994…a fast moving snow storm dumped 8 to 9 inches of snow on Boulder…Broomfield…and Lafayette. Snowfall totaled only 1.8 inches at Stapleton International Airport where on the 3rd east winds gusted to 20 mph and some freezing drizzle fell.

In 2022…a massive crash occurred as freezing temperatures and icy conditions followed the first snowfall of the season… most of which fell the previous evening. Hazardous conditions developed in Denver along an elevated portion of 6th Avenue during the early morning commute. The crash involved approximately 100 vehicles. There were no serious injuries… although one driver had to be extricated from a vehicle. The accidents occurred between Kalamath Street and Federal Boulevard. Numerous tow trucks took damaged or inoperable vehicles to a parking lot outside Empower Field at Mile High. The icy road conditions made it impossible for drivers to prevent from slamming into each other. A major cleanup had to take place before 6th was reopened later in the morning. The closure lasted approximately 5 hours. Several crashes occurred along Interstates 25 and 70…and included a multi-vehicle accident on the onramp from US 36 to I-25. Storm totals in the mountains and foothills generally ranged from 4 to 12 inches. At the National Weather Service in Boulder…6.6 inches of snowfall was observed. At Denver International Airport…4.5 inches was observed.

Continue reading November 2 to November 8: This Week in Denver Weather History

October 26 to November 1: This Week in Denver Weather History

This Week in Denver Weather HistoryWind can be one of the most frustrating weather conditions to experience and our look back at this week in Denver weather history shows the period has seen more than its fair share. Also notable are many significant snow events that have occurred in the Mile High City over the seven day period.

From the National Weather Service:

25-27

In 2021…the minimum temperature at Denver International Airport dropped into the single digits for three consecutive mornings: 8 degrees…4 degrees and 8 degrees respectively.

26

In 2010…very strong winds during the day knocked down power lines in parts of Boulder. The downed electrical lines sparked a small brush fire near Columbine Elementary School. Strong wind gusts also damaged the tennis bubble at the Millennium Harvest House. In Northglenn, a tree was knocked down and caused minor damage to a mini-van parked nearby. Peak wind gusts included: 70 mph at Berthoud…67 mph at Rocky Mountain Metropolitan Airport in Broomfield… 63 mph at the Rocky Flats National Wind Technology Center and 59 mph at the NCAR Mesa Laboratory…3 miles southwest of Boulder. West winds gusted to 43 mph at Denver International Airport.

In 2011…a powerful early season storm brought heavy snow to the Front Range and adjacent plains. The heavy…wet snow caused extensive downed large branches and in some cases…entire trees. Massive power outages occurred from Fort Collins and Greeley south to Denver and the surrounding metro area. Most of the trees still had their leaves…which helped to catch snow and down trees under the weight of the moisture laden snow. Nearly two hundred thousand utility customers along the Front Range were without heat and electricity for several hours. The Red Cross opened four temporary shelters overnight until the power could be restored. The outages also forced the closure of the Boulder Criminal Justice Center the following day. The fallen trees and branches also caused extensive property damage to roofs and automobiles. In the Front Range mountains and foothills…storm totals included 19.8 inches…3 miles west of Jamestown; 18 inches…5 miles west of copper; 13 inches…3 miles north of Blackhawk and 3 miles south of Evergreen…4 miles east-northeast of Nederland and Lake Eldora; 12 inches at Berthoud SNOTEL. Across the urban corridor storm totals included: 11.5 inches in Boulder; 9.5 inches at the national weather service in Boulder; 9 inches…1 mile southwest of Westminster; 8.5 inches in Broomfield… Denver International Airport…Frederick and Louisville; 8 inches in Aurora…7 inches in Watkins; with 6 inches in Arvada.

25-26

In 1996…4 to 6 inches of snow fell in the foothills west of Denver. Only 1.5 inches of snowfall were measured at the site of the former Stapleton International Airport on the 26th. This was the only measurable snow of the month at the site. The snowfall produced icy and snowpacked highways…which resulted in a 50-to 60-car pileup on I-25 south of metro Denver. West winds gusted to 33 mph at Denver International Airport.

In 2006…a winter storm brought heavy snowfall to metro Denver and the eastern foothills. Total snowfall ranged from 12 to 22 inches over the higher terrain and 6 to 12 inches across metro Denver. Northerly winds at sustained speeds of 20 to 30 mph with gusts as high as 47 mph at Denver International Airport whipped the snow into drifts 3 to 4 feet deep. Many tree limbs snapped under the weight of the heavy…wet snow which also downed power lines… Leaving thousands of residents without power. Storm total snowfall included: 25 inches near Aspen Springs…Conifer… And Evergreen; 23.5 inches near Rollinsville; 23 inches in Idaho Springs; 22.5 inches near Blackhawk; 21.5 inches near Bailey; 19 inches near Bergen Park; 18 inches near Aspen Springs…Genesee…and Jamestown; 17 inches southwest of Boulder; 16 inches in Evergreen; and 15 inches near Georgetown and Perry Park. Snowfall totaled 5.3 inches in the Denver Stapleton area. At Denver International Aiport…rain…including a thunderstorm…changed to snow on the evening of the 25th after a high temperature of 70 degrees.

In 2010…a storm system brought heavy snow to the mountains west of Denver. Storm totals included: 24 inches at the Eisenhower Tunnel…18 inches at Loveland Ski Area; with 16 inches at Arapahoe basin.

25-27

In 1897…a major storm dumped 13.5 inches of snowfall over downtown Denver. Rain changed to snow during the evening of the 25th and continued through mid-morning of the 27th. Most of the snow…12.0 inches…fell on the 26th when north winds were sustained to 36 mph and gusts were as high as 46 mph. Temperatures during the storm were in the 20’s and lower 30’s. Precipitation (rain and melted snow) totaled 1.21 inches.

Continue reading October 26 to November 1: This Week in Denver Weather History

October 19 to October 25: This Week in Denver Weather History

This Week in Denver Weather History

As we enter the latter half of October, wintry weather stands a better chance of occurring. Our look back at this week in Denver weather history shows many snowy events including a record-setting storm in 1997 that dumped nearly 22 inches on the Mile High City.

From the National Weather Service:

17-19

In 1908…a moist…heavy…wet snowfall totaled 13.0 inches in downtown Denver over the 3 days. Rain from early morning on the 17th changed to snow by late afternoon and continued through the late morning of the 19th. Due to temperatures in the 30’s and melting…the most snow on the ground was only 5.0 inches at 6:00 pm on the 18th. Northwest to northeast winds were sustained between 12 and 20 mph during the storm. Precipitation totaled 1.82 inches.

18-23

In 2003…an extended warm spell resulted in 5 new temperature records. The high temperature of 84 degrees on the 18th equaled the record high for the date. High temperatures of 86 degrees on the 19th…83 degrees on the 21st…and 84 degrees on the 22nd were record highs for the dates. Low temperature of 49 degrees on the 23rd was a record high minimum for the date. Low temperatures during the period were in the 40’s and lower 50’s.

19

In 1887…northwest winds sustained to 42 mph were recorded in the city.

In 1982…3 to 6 inches of snow fell over northwest metro Denver…including Boulder. Only 1.2 inches of snowfall were recorded at Stapleton International Airport where north winds gusted to 35 mph. This was the first measurable snowfall of the season.

19-20

In 1990…an early winter storm dumped heavy snow across metro Denver. Snowfall amounts ranged from 4 to 8 inches in the foothills above 6500 feet elevation…4 to 7 inches in the Castle Rock area…and 2 to 5 inches across most of metro Denver and Boulder. Snowfall totaled 3.6 inches at Stapleton International Airport where northwest winds gusting to 48 mph kicked up some blowing dust shortly after a cold frontal passage on the 19th. However… Temperatures were warm enough to keep most roadways wet and slushy at lower elevations.

19-23

In 1906…heavy snowfall totaled 22.7 inches in the city over the 5 days. Rain changed to snow on the evening of the 19th…and snow continued through the late afternoon of the 23rd. The heaviest amount of snowfall…16.0 inches…fell from 8:00 pm on the 20th to 8:00 pm on the 22nd. The most snow on the ground was 13.3 inches on the evening of the 23rd. This was the first snow of the season and the only snow of the month. Winds during the storm were from the north at sustained speeds of 20 to 30 mph each day. Temperatures during the storm were generally in the 20’s.

20

In 1878…between 3:00 pm and 4:00 pm wind speeds averaged 48 mph with a maximum 1 minute sustained velocity to 96 mph at both 3:27 pm and 3:48 pm in downtown Denver. This is the highest sustained wind speed ever recorded in the city.

In 1986…a rare late October thunderstorm produced 3/4 inch diameter hail at Centennial Airport. Hail piled up 2 1/2 inches deep…causing some street flooding in south metro Denver.

In 2019…strong bora winds swept across the foothills and adjacent plains. Peak gusts included: 82 mph…3 miles southwest of Rocky Flats; 78 mph near White Ranch Open Space; 75 mph near Genesee and Georgetown; with 63 mph at Firestone. At Denver International Airport…a peak gust of 49 mph was observed from the west.

20-21

In 2007…a storm system brought heavy snow to the southern Denver suburbs as well as the Palmer Divide south of Denver. Storm totals included: 7.5 inches near Castle Rock…Lone Tree and Greenwood Village…with 6.5 inches at Elizabeth. Snow drifts up to 2 feet deep were observed 6 miles south-southwest of Elizabeth. In the Denver Stapleton area…2.0 inches of snow was observed.

In 2009…heavy snow developed along the palmer divide south and southeast of Denver as a storm system tracked across southern Colorado and northern New Mexico. Storm totals included: 15 inches…15 miles north of Elizabeth…9 inches…5 miles south-southwest of Arapahoe Park; 8 inches in Highlands Ranch…5 miles south- southeast of Sedalia; 6.5 inches…8 miles southwest of Bennett and 6 inches in Parker. At Denver International… Only 1.5 inches of snowfall was observed.

Continue reading October 19 to October 25: This Week in Denver Weather History

February 25 to March 3: This week in Denver weather history

This Week in Denver Weather History

In the past week Denver has seen its fair share of wind and snow and looking back at this week in Denver weather history, we see both are common conditions.

From the National Weather Service:

22-29

In 1960…heavy snowfall of 6.1 inches at Stapleton Airport on the 22nd and 23rd marked the beginning of a protracted cold spell which lasted until the end of the month. The cloudy… Cold weather was accompanied by occasional light snow or flurries and fog. New record low temperatures for the dates were set on the 24th thru the 29th with the lowest temperature of 11 degrees below zero on the 28th. The seven consecutive days of low temperatures of zero or below had been exceeded in duration only 4 times previously. New low maximum temperatures for the dates were set on the 23rd… 24th…and the 26th thru the 29th with the lowest maximum temperature of 8 degrees recorded on the 26th.

23-25

In 1912…a severe winter storm dumped 14.2 inches of snowfall over downtown Denver. Snow fell continuously from 9:40 am on the 23rd until 9:15 pm on the 25th with most of the snow… 9.2 inches…on the 24th. Temperatures were mostly in the 20’s. Northeast winds were sustained to 20 mph on the 24th.

24-25

In 2021…moderate to heavy snow developed in and near the foothills of Boulder…Douglas and Jefferson counties which included Denver and surrounding metro area. Storm totals included: 16.3 inches in Englewood; 15.5 inches near Cherry Hills Village; 14 inches near Highlands Ranch…13 inches Littleton; 12.5 inches near Ken Caryl…12 inches near Chatfield Reservoir and southeast Denver; 11 inches near Federal Heights…Thornton and Westminster; 10.5 inches in Arvada…10 inches near Eldorado Springs…9.5 inches near Lafayette and Louisville; 9 inches in southwest Boulder and near Foxfield and Strasburg; 8.5 inches near Broomfield; 7 inches near Wheat Ridge. The official measurement at Denver International Airport was 9.6 inches.

25-26

In 1971…a wind gust to 100 mph was recorded in Boulder at the National Center for Atmospheric Research. The cold west winds gusted to 53 mph in downtown Boulder. No damage was reported. Northwest winds gusted to 31 mph on the 25th and to 38 mph on the 26th at Stapleton International Airport.

In 1984…a heavy snow storm left 1 to 2 feet of new snow in the foothills west of Denver. I-70 was closed…stranding skiers returning from the mountains. Most had to spend several hours in Idaho Springs. The snow spread over metro Denver with 9 inches at Littleton…Castle Rock…and Boulder and up to 5 inches in Aurora and Denver. Snowfall totaled only 3.6 inches at Stapleton International Airport where north winds gusted to 31 mph.

26

In 1884…heavy snowfall totaled 6.0 inches in downtown Denver.

In 1908…a duststorm occurred in the city during the afternoon. Northwest winds were sustained from 14 to 24 mph.

In 1918…pre-frontal Chinook winds from the southwest… Sustained to 43 mph with a maximum velocity to 52 mph… Warmed temperatures to a high of 62 degrees.

In 1954…strong Chinook winds gusting to 52 mph during the morning warmed the temperature in Denver to a balmy 65 degrees by early afternoon. A vigorous Canadian cold front during the late afternoon produced north winds at sustained speeds of 52 mph with gusts as high as 65 mph and billows of blowing dust…which reduced the visibility to as low as 1 mile at Stapleton Airport. Showers left half an inch of snow on the ground as the temperature dipped to a low of 27 degrees before midnight.

In 1989…a brief rain shower produced a microburst wind gust to 51 mph at Stapleton International Airport.

In 1997…snowfall totaled 4 to 6 inches in and near the foothills. Only 0.8 inch of snow fell at the site of the former Stapleton International Airport. Northeast winds gusted to 29 mph at Denver International Airport.

In 2013…a storm system produced heavy snow in the Front Range Foothills. Storm totals included: 12 inches near Black Mountain and Pine Junction…10 inches near Conifer and Nederland; 9 inches…12 miles northwest of Golden; 8 inches near Evergreen…with 6 inches near Eldorado Springs. Snow and blowing snow produced blizzard conditions along and south of the Interstate 70 corridor…just east of Denver.  Storm totals generally ranged from 3 to 7 inches. North winds of 25 to 30 mph were reported with gusts around 40 mph. Roads became impassable as snow and blowing snow produced 3 to 4 ft snow drifts. Interstate 70 was closed from Aurora to the Kansas state line. At Denver International Airport…a peak wind gust to 31 mph was reported along with 1.0 inch of snow.

26-27

In 1893…heavy snowfall totaled 7.9 inches in downtown Denver. Most of the snow…6.7 inches…fell on the 27th. Northeast winds were sustained to 18 mph with gusts to 30 mph behind an apparent cold front.

In 1939…heavy snowfall of 8.1 inches was the heaviest of the month in downtown Denver. North winds sustained to 21 mph on the 26th and to 28 mph on the 27th caused much drifting. The greatest snow depth on the ground was 7.8 inches at noon on the 27th.

In 1987…a snowstorm dropped 4 to 8 inches of snow across metro Denver…causing flight delays at Stapleton International Airport where snowfall totaled 3.8 inches and north winds gusted to 24 mph. Both I-70 and I-25 were closed for a time to the east and south of Denver.

27

In 1896…northwest winds were sustained to 46 mph with gusts to 58 mph.

In 1902…northwest winds were sustained to 50 mph with gusts as high as 60 mph. The high temperature was 44 degrees.

In 1918…a post-frontal heavy snow storm developed over downtown Denver. Snowfall totaled 8.4 inches and north winds were sustained to 30 mph with a maximum velocity to 32 mph.

In 1963…west winds gusted to 55 mph at Stapleton Airport.

In 1974…a wind gust to 99 mph was recorded in Boulder. West winds gusted to 43 mph at Stapleton International Airport.

In 2009…a strong wind gusts blew a trailer in the path of two vehicles along State Highway 36…between Boulder and Lyons. The two vehicles were in the northbound lane when a wind gust blew a fifth-wheel trailer into their path… As it approached from the opposite lane. The trailer left the road surface…and collided with the top left side of the first car; causing extensive damage. A van following the first vehicle then struck the trailer. The driver of the van suffered facial injuries.

27-28

In 1918…heavy snowfall totaled 9.6 inches in downtown Denver. Most of the snow…8.4 inches…fell on the 27th.

In 1931…a major winter storm dumped 12.0 inches of heavy snowfall over downtown Denver. This is the greatest 24 hour snowfall ever recorded during the month of February. North winds gusted to 18 mph on the 28th.

In 2006…a warm spell resulted in 3 temperature records. The high temperature of 73 degrees on the 27th equaled the record high for the date. High temperature of 77 degrees on the 28th was a record high for the date and equaled the all time record high temperature for February first set on February 4…1890.

28

In 1896…northwest winds were sustained to 54 mph with gusts to 65 mph. The winds warmed the temperature to a high of 56 degrees. This was the second consecutive day of strong winds in the city.

In 1958…at Stapleton Airport…snowfall totaled 5.3 inches and northeast winds gusted to 24 mph.

28-29

In 2012…another round of high winds occurred along the Front Range Foothills. Peak wind gusts included: 84 mph at the National Wind Technology Center; 77 mph…3 miles south-southwest of Boulder; and 75 mph…3 miles southwest of Rocky Flats. At Denver International Airport…west winds gusted to 36 mph on the 28th and 35 mph on the 29th.

28-1

In 1875…6 inches of snow fell from 3:15 pm on the 28th to 1:00 am on the 1st. Precipitation for the two days was 0.50 inch.

Continue reading February 25 to March 3: This week in Denver weather history

February 18 to February 24: This week in Denver weather history

This Week in Denver Weather History

Damaging winds are not uncommon along the Colorado Front Range, particularly this time of year when strong Bora and Chinook winds can rage. We see a number of such events in our look back at this week in Denver weather history. Also making an appearance are a number of notable snow and cold events.

From the National Weather Service:

16-18

In 1970…a wind gust to 90 mph was recorded in Boulder at the National Center for Atmospheric Research. In downtown Boulder…sustained winds of 30 to 40 mph with gusts to 53 mph were measured. Damage was minor. West winds gusted to 45 mph at Stapleton International Airport on the 17th. The strong Chinook winds warmed the temperature to 70 degrees on the 16th and to 72 degrees on the 17th…both records for the date. The low temperature dipped to only 32 degrees on the 16th equaling the record high minimum for the date.

17-18

In 1976…a strong cold front produced wind gusts 30 to 60 mph with much blowing snow and severe dust storms. In the Boulder area…high winds collapsed a garage and broke some windows. Northwest winds gusted to 43 mph on the 17th and to 44 mph on the 18th at Stapleton International Airport.

In 1984…the third blizzard in a week struck eastern Colorado. Heavy snow hit some parts of metro Denver with 8 to 10 inches measured in Aurora…but only 2.9 inches of snow fell at Stapleton International Airport where northwest winds gusted to 31 mph.

In 1999…damaging downslope Bora winds developed in the foothills behind a strong cold front. Peak wind reports included: 90 mph at the Gamow Tower on the University of Colorado campus in Boulder; 79 mph at the National Center for Atmospheric Research mesa lab near Boulder and at the national wind technology center south of Boulder; and 72 mph atop Blue Mountain and at Jefferson County Airport. Downed power lines caused major outages for at least 10 thousand residents in Evergreen…Idaho Springs…Golden… And Lakewood. In Golden…the wind toppled a lightning static protection line atop a 70-foot…230 thousand-volt distribution tower. The downed line…sparked a small grass fire just east of the Lookout Mountain youth services center. The fire burned a path approximately 100 yards wide and 1/3 mile long before it was contained.

In 2000…snow…heavy in the mountains and foothills…spread over metro Denver. Snowfall totaled 24 inches at the Eldora Ski Resort with 8 inches measured near Blackhawk. Snowfall was only 1.8 inches at the site of the former Stapleton International Airport…which was the only measurable snow of the month.

In 2018…high winds developed over portions of the Front Range  mountains and foothills. Peak wind gusts included: 98 mph…  2 miles south-southeast of Gold Hill…86 mph atop Berthoud  Pass…with 75 mph…3 miles east of Gold Hill.

In 2021…a storm system produced moderate to heav snow which  impacted locations in and near the Front Range Foothills  and Palmer Divide. Storm totals included: 12.5 inches at  Conifer…11 inches near Evergreen…Larkspur and Morrison…  10.5 inches near Genesee and Pinecliffe…10 inches near  Jamestown…9 inches near Crisman and Marshall…8.5 inches  near Eldorado Springs…8 inches in Boulder and Monument; 6  inches near Ken Caryl…Lafayette and Niwot; 5.5 inches at  the National Weather Service Office in Boulder…with 5  inches in Arvada and Hygiene.  At Denver International  Airport…0.8 inch of snowfall was observed.

17-19

In 2006…a cold spell resulted in 4 temperature records. Low temperatures of 10 degrees below zero on the 17th… 13 degrees below zero on the 18th…and 4 degrees below zero on the 19th were record minimums for those dates. The high temperature of only 7 degrees on the 18th was a record low maximum for the date. Light snow fell on the 17th…but totaled less than half an inch at Denver International Airport.

18

In 1918…post-frontal northwest winds were sustained to 40 mph with a measured extreme velocity to 44 mph.

In 1937…a moderate duststorm occurred during the late afternoon and early evening. Northeast winds sustained to 32 mph with gusts to 41 mph reduced the visibility to 1/2 mile which persisted for about 40 minutes in the city.

In 1998…rare thunder from instability rain and snow showers was heard in Littleton during the late afternoon. Thunder in February only occurs about once every 10 years over metro Denver.

18-19

In 1954…a vigorous cold front produced north winds gusting to 56 mph and a trace of snowfall at Stapleton Airport on the 18th. Strong and gusty winds to 55 mph persisted through the next day and caused some blowing dust.

In 1955…a storm dumped heavy snow across metro Denver. At Stapleton Airport where north winds sustained to 28 mph produced some blowing snow…snowfall totaled 8.8 inches.

18-20

In 1913…post-frontal snowfall totaled 6.9 inches in downtown Denver over the 3 days. Most of the snow fell on the 19th. Northeast winds were sustained to 21 mph with a measured extreme velocity to 24 mph on the 18th.

In 1924…light snowfall totaled 4.6 inches over the 3 days. This was the only measurable snowfall of the month. High temperatures plunged from 45 degrees on the 18th to 17 degrees on the 20th. Low temperatures dipped from 31 degrees on the 18th to only 8 degrees on the 20th. Northeast winds were sustained to 24 mph on the 19th.

In 1953…a major blizzard dumped 10.6 inches of snowfall at Stapleton Airport. Strong north winds at sustained speeds of 25 to 35 mph with gusts as high as 44 mph frequently reduced visibilities to 1/4 mile in blowing snow during the day of the 19th. The strong winds caused much drifting snow…making accurate snowfall measurements almost impossible. Precipitation from the storm totaled 1.13 inches. The 1.01 inches of precipitation on the 19th was the greatest calendar day and 24 hour precipitation ever recorded in the city during the month of February.

In 1987…large amounts of new snow fell in the Front Range foothills. The foothills received 10 to 20 inches of new snow with 4 to 8 inches on the adjacent plains. On the 19th…flight delays occurred at Stapleton International Airport where snowfall totaled 4.2 inches and east winds gusted to only 18 mph on the 19th. Schools were closed in the foothills above Boulder.

19

In 1899…northwest winds sustained to 42 mph with gusts to 45 mph warmed the temperature to a high of 56 degrees… The highest reading of the month that year.

In 1980…high winds were reported in Boulder. Sustained speeds of 50 to 60 mph with gusts to 85 mph were measured. West winds gusted to 31 mph at Stapleton International Airport.

In 1986…Chinook winds continued to buffet the eastern foothills. Winds gusting from 60 to 75 mph were common in the foothills. West winds gusted to 41 mph at Stapleton International Airport.

In 1996…high winds gusting from 70 to 75 mph were reported atop Table Mesa near Boulder. West winds gusted to 44 mph at Denver International Airport.

In 2007…this was the last day of 61 consecutive days with snow cover of 1 inch or more in Denver. This second longest period of snow cover on record began with the blizzard on December 20-21…2006…when 20.7 inches of snow fell at the site of the former Stapleton International Airport where official snow measurements were taken. Additional snowfall during December…January…and February prolonged the event. Snow depth on the ground was measured to the nearest inch once daily at 6:00 am MST.

In 2018…a storm system brought a period of upslope snowfall to locations in and near the Front Range Foothills. Storm totals included: 9 inches in Louisville…8.5 inches at Lafayette and 2 miles south of Rocky Flats National Wildlife Refuge…8 inches…2 miles south of Boulder and 3 miles north-northeast of Eldorado Springs; 7.5 inches in Erie…7 inches…3 miles west-northwest of Arvada and at the National Weather Service in Boulder; 6 inches at Copeland Lake… Evergreen…3 miles northwest of Idledale and Intercanyon. At Denver International Airport…a trace of snowfall was observed.

19-20

In 1937…post-frontal heavy snowfall totaled 8.4 inches over downtown Denver. Most of the snow…6.6 inches…fell on the 20th when north winds were sustained to 16 mph with gusts to 18 mph. The temperature dipped to a low of 9 degrees on the 20th.

In 1939…post-frontal snowfall totaled 5.4 inches in the city. The snow covered streets and highways with a coating of ice as the temperature fell from 36 degrees at 2:00 pm on the 19th to a low of 4 degrees at 3:00 am on the 20th. Many motorists were marooned for several hours. Northeast winds were sustained to 24 mph on the 19th.

19-21

In 1971…heavy snowfall totaled 9.0 inches at Stapleton International Airport where north winds gusted to only 16 mph. Most of the snow occurred on the 19th and 20th. The 24 hour snowfall of 8.2 inches was the greatest in February since 1953.

Continue reading February 18 to February 24: This week in Denver weather history

February 11 to February 17: This Week in Denver Weather History

This Week in Denver Weather History

Denver’s weather is often a story of extremes and even in what is historically a calm period like February, significant events can and do occur. From record-setting Arctic cold that sent temperatures to far below zero to powerful, damaging wind, this week in Denver weather history has been an eventful one.

From the National Weather Service:

31-12

In 1899…a protracted cold spell lasted almost two weeks. Low temperatures plunged below zero on all days but February 9th with a reading of 6 degrees. The coldest low temperature of 22 degrees below zero on February 6th was a record low for the date. Low temperatures of 20 degrees below zero occurred on both February 11th and 12th… But only the 11th remains as the record minimum for the date. High temperature of only 5 degrees below zero on February 11th was a record low maximum for the date. High temperatures climbed to only zero degrees on both February 2nd and 3rd…but were not records. Intermittent light snow or flurries fell during the period. The most snowfall…2.0 inches…occurred on February 2nd.

5-11

In 1978…the 5th marked the start of a record 7 consecutive days of dense fog at Stapleton International Airport. The heavy fog reduced the visibility to 1/4 mile or less for a period of time on each of these days. Light snow and/or freezing drizzle occurred on most days. Fog reducing visibility to less than 7 miles was recorded at Stapleton International Airport on 11 consecutive days through the 15th. During the period 5-14…the cold thick fog deposited heavy rime ice up to 5 inches thick on power lines and poles over a wide area of eastern Colorado…causing a major electrical power outage disaster.

9-11

In 1965…heavy snowfall totaled 6.2 inches at Stapleton International Airport where northeast winds gusted to 25 mph.

In 1993…the same storm that dumped heavy snow in the mountains combined with an arctic cold front to produce heavy snow across metro Denver. Upslope snows of 4 to 8 inches were common with some areas receiving nearly a foot. Ten inches of new snow were measured in Parker and 7 inches in southeast Denver. At Stapleton International Airport… Snowfall totaled 8.1 inches. Strong winds combined with the snowfall to produce near-blizzard conditions over the plains closing many roads east of Denver. North winds gusted to only 18 mph at Stapleton International Airport on the 9th.

10-11

In 1971…a wind gust to 80 mph was recorded in Boulder at the National Center for Atmospheric Research. A wind gust to 69 mph was measured at the National Bureau of Standards. In downtown Boulder wind gusts to 43 mph were clocked. No damage was reported. North to northwest winds gusted to 39 mph on the 10th and to 41 mph on the 11th at Stapleton International Airport.

In 1999…heavy snow developed over sections of metro Denver during the evening hours. Snowfall totals included: 6 inches at Eaglecrest…6.5 inches at Highlands Ranch…and 8.5 inches about 5 miles south of Sedalia. Only 1.0 inch of snow fell at the site of the former Stapleton International Airport. Strong winds and snow caused near blizzard conditions north of metro Denver.

10-12

In 1958…heavy snow fell across metro Denver. At Stapleton Airport…where northeast winds gusted to 22 mph…6.7 inches of snowfall were measured.

In 1995…cold arctic air brought heavy snow to the foothills and western Denver suburbs. Golden measured 15 inches of snow with 14 inches in south Boulder. Locations in the foothills recorded between 10 and 15 inches of snow. Only 6.1 inches of snow fell at Stapleton International Airport where north winds gusted to 30 mph on the 10th.

10-13

In 1905…an extremely cold arctic air mass moved over the city behind a cold front on the 10th and persisted through the morning of the 13th. North winds were sustained to 25 mph behind the front on the 10th dropping the temperature to a low of 2 degrees below zero…which was also the high reading on the 11th. Light snowfall totaled 3.0 inches overnight of the 10th into the 11th. The low temperature plunged to 19 degrees below zero on the 11th. Records were set on the 12th and 13th. The high temperature of only zero degrees on the 12th was a record low maximum for the date. The low readings of 21 degrees below zero on the 12th and 14 degrees below zero on the 13th were record minimum temperatures for those dates.

11

In 1875…northwest winds were brisk all day. The velocities increased to 30 to 50 mph during the early evening.

In 1957…Chinook winds gusting to 49 mph warmed the temperature to a high of 64 degrees at Stapleton Airport.

In 1971…a rare February thunderstorm produced 1/4 inch diameter hail in southwest Denver.

In 1981…the cold spell of the 10th came to a quick end with strong Chinook winds. Gusts to 84 mph were recorded at mines peak and to 80 mph at Wondervu. Gusts in the foothills ranged from 50 to 65 mph. Southwest winds gusted to only 23 mph at Stapleton International Airport.

In 1984…a near-blizzard across eastern Colorado closed I-70 east of Denver and stranded 1200 motorists at Limon. Only 0.9 inch of snow fell at Stapleton International Airport where north winds gusted to 43 mph.

In 1988…wind gusts to 77 mph were measured at Echo Lake. West winds gusted to only 32 mph at Stapleton International Airport.
11-12 in 1899…the temperature plunged to lows of 20 degrees below zero on both days.

In 1900…northwest winds sustained to 52 mph with gusts to 60 mph warmed the temperature to a high of 58 degrees on the 11th. An apparent cold front overnight produced 3.7 inches of snow and northeast winds gusting to 30 mph. The high temperature on the 12th was only 26 degrees.

In 1994…moist upslope winds and an upper level storm system produced heavy snow over western portions of metro Denver. Snowfall amounts totaled 10 inches in Golden and 8 inches at Strontia Springs Reservoir 15 miles southwest of Denver in the South Platte canyon. Snowfall at Stapleton International Airport totaled only 3.6 inches…but north winds gusting to 35 mph on the 11th produced occasional visibilities as low as 1/4 mile in heavy snowfall and blowing snow.

11-12

In 1899…the temperature plunged to lows of 20 degrees below zero on both days.

In 1900…northwest winds sustained to 52 mph with gusts to 60 mph warmed the temperature to a high of 58 degrees on the 11th. An apparent cold front overnight produced 3.7 inches of snow and northeast winds gusting to 30 mph. The high temperature on the 12th was only 26 degrees.

In 1994…moist upslope winds and an upper level storm system produced heavy snow over western portions of metro Denver. Snowfall amounts totaled 10 inches in Golden and 8 inches at Strontia Springs Reservoir 15 miles southwest of Denver in the South Platte canyon. Snowfall at Stapleton International Airport totaled only 3.6 inches…but north winds gusting to 35 mph on the 11th produced occasional visibilities as low as 1/4 mile in heavy snowfall and blowing snow.

11-13

In 1903…west to northwest Chinook winds gusting to 34 mph warmed the temperature to a high of 50 degrees on the 11th… Before temperatures rapidly plunged to a low of 14 degrees behind a cold front. Light snow fell through the 13th and totaled 4.2 inches in the city…while temperatures ranged from a high of 14 degrees on the 12th to a low of 5 degrees below zero on the 13th.

12

In 1874…5 inches of snow fell in downtown Denver. Melted snow resulted in 0.31 inch of precipitation.

In 1875…forest fires burned very brightly in the foothills to the west of Denver.

12-13

In 1915…heavy snowfall totaled 7.0 inches over downtown Denver. Northwest winds were sustained to 24 mph on the 13th.

In 1951…heavy snowfall totaled 8.1 inches at Stapleton Airport where northeast winds gusted to 28 mph on the 12th.

In 1968…snowfall totaled 5.6 inches at Stapleton International Airport where northeast winds gusted to 26 mph. Snow fell all day on the 12th and into the morning hours of the 13th.

In 1997…heavy snow fell in the foothills southwest of Denver. Conifer…Evergreen…Morrison…and north turkey creek received 6 to 8 inches of new snow overnight. Only 0.2 inch of snow fell at the site of the former Stapleton International Airport. North-northeast winds gusted to 23 mph at Denver International Airport on the 13th.

12-16

In 2021…the daily low temperatures dropped to zero degrees or colder through the 5-day stretch. These were the only sub-zero temperatures recorded for the 2020-21 winter season. Even the maximum daily temperatures during this stretch were cold…with highs only managing to warm into the single digits on the 13th and 14th.

13

In 1886…northwest winds were sustained to 40 mph during the early morning hours…but winds were strong and gusty all day.

In 1918…west winds were sustained to 42 mph with a measured extreme velocity to 44 mph. The strong Chinook winds warmed the temperature to a high of 58 degrees.

In 1988…high winds raked metro Denver. Boulder reported a wind gust to 67 mph with 63 mph at Lakewood and 49 mph at Stapleton International Airport. The strong winds toppled a tree onto a car in Aurora. Northwest winds gusting to 49 mph at Stapleton International Airport warmed the temperature to a high of 64 degrees.

In 2010…a peak wind gust to 89 mph was recorded in Boulder. North winds gusted to 28 mph at Denver International Airport.

Continue reading February 11 to February 17: This Week in Denver Weather History

February 4 to February 10: This week in Denver weather history

This Week in Denver Weather History

February is generally a relatively calm weather month however just like any other month in Denver, it can and does see its extremes. In looking back at the Denver weather history calendar for the week, there are many entries for damaging wind, some heavy snowfall and extreme cold.

From the National Weather Service:

30-7

In 1985…a cold front on the 29th produced a protracted cold spell as arctic air remained entrenched across metro Denver. While the only daily temperature record set was a low maximum reading of 2 degrees on February 3rd…minimum temperatures plunged well below zero on 9 consecutive days. The coldest readings were 15 degrees below zero on January 31st and 14 degrees below zero on February 5th.

31-8

In 1963…warm weather that began with the strong Chinook winds on the 31st and 1st continued through the 8th. Maximum temperatures through the period ranged from 52 degrees on the 2nd to 76 degrees on the 5th…which was a new record high for that date.

31-12

In 1899…a protracted cold spell lasted almost two weeks. Low temperatures plunged below zero on all days but February 9th with a reading of 6 degrees. The coldest low temperature of 22 degrees below zero on February 6th was a record low for the date. Low temperatures of 20 degrees below zero occurred on both February 11th and 12th… But only the 11th remains as the record minimum for the date. High temperature of only 5 degrees below zero on February 11th was a record low maximum for the date. High temperatures climbed to only zero degrees on both February 2nd and 3rd…but were not records. Intermittent light snow or flurries fell during the period. The most snowfall…2.0 inches…occurred on February 2nd.

1-4

In 2011…a frigid arctic airmass settled into Front Range urban corridor. At Denver International Airport… Overnight low temperatures…from the 1st to the 3rd… Were 13 below zero…17 below zero and zero respectively. The icy temperatures caused pipes to crack and burst following the freeze. In Loveland…firefighters responded to more than a dozen water pipe breaks…most in fire sprinkler systems at businesses…apartments and assisted care facilities. At cu earth science library in Boulder…more than 1000 books and several costumes for an upcoming production were damaged. At the county courts administration building in Jefferson County…a steady stream of water from a crack on the 5th floor… Went unnoticed on the 3rd and flooded all the floors of the administration wing overnight. As a result…much of the office equipment…furniture and carpet sustained water damage. A burst sprinkler line caused minor damage at the Platte Valley Medical Center in Brighton. The icy temperatures forced to closure of several school districts as well.

1-5

In 1985…the most bitter cold spell of the winter season brought sub-zero temperatures to metro Denver. Daily low temperature records were broken at Denver. The usual cold weather problems struck including stalled vehicles…jammed traffic lights…and frozen water and sewer lines. At Stapleton International Airport…the high temperature was only 2 degrees above zero on the 1st…setting a record low maximum for the date. Low temperatures reached 13 below zero on the 1st…12 below on the third…and 14 below on the 5th.

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In 1989…one of the century’s worst doses of winter weather ravaged the entire state. Bitterly frigid weather moved into metro Denver on the 1st as snow buried many sections of the state. In metro Denver where 3 to 6 inches of snow fell…blowing snow and resultant poor visibilities caused a 46-car pile-up on I-25 in the middle of the city on the 4th. During the period…2 to 3 hour delays were common at Stapleton International Airport where snowfall from the storm totaled 4.3 inches and northeast winds gusted to 30 mph on the 1st. Intense cold accompanied the storm. Temperatures in Denver stayed below zero continuously for the best part of 3 days (3rd…4th…5th)…for a total of 69 hours. This is the fourth longest sub-zero period on record. Wind chill temperatures reached 50 degrees below zero. The mercury dipped to 24 degrees below zero on the 5th…setting a record for the date. This was the city’s coldest temperature in over 26 years. Low temperatures dipped below zero on 8 consecutive days (2nd-9th). High temperature of 9 degrees below zero on the 4th was a record low maximum for the date…as was the high of 5 degrees on the 5th. Extensive damage occurred when pipes and water lines froze and broke. Thousands of cars failed to start. On the 3rd…a 57-year-old woman died of hypothermia in an Arvada park. Eighteen high school students were treated for hypothermia after a 2-hour ride through Jefferson County in an unheated bus. At least 2 cases of frostbite were reported; there were undoubtedly many more.

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In 1883…a protracted cold period occurred when low temperatures dipped below zero for 9 consecutive days. Low temperatures ranged from 22 degrees below zero on the 4th to 2 degrees below zero on the 1st and 6th. High temperatures ranged from 10 below zero on the 3rd to 23 on the 9th. Several temperature records were set that still stand today. Record lows of 18 below and 22 below zero occurred on the 3rd and 4th. Record low maximum readings of 2 below and 10 below zero occurred on the 2nd and 3rd. The high of only 10 below zero on the 3rd is the coldest maximum temperature ever recorded in Denver.

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In 2012…a slow moving and powerful storm system brought heavy snow to areas in and near the Front Range Foothills and Palmer Divide…with blizzard conditions over the northeast plains of Colorado. In the Front Range Foothills…the snow piled up to over 4 feet in some areas. Across the Palmer Divide…the combination of snow and gusty winds resulted in road closures with snow drifts ranging from 2 to 5 feet in depth. Northerly winds 15 to 25 mph were common with gusts to 40 mph. Several snowfall records were also set in Denver. At Denver International Airport…12.5 inches of snow feet on the 3rd shattered the previous record of 7.5 inches for the date. It also set a new daily record for the entire month of February. A new 3-day record was also established for Denver. The 3-day storm total from February 2nd to the 4th was 15.9 inches… which broke the previous record of 14.1 inches in 1912. Denver International Airport canceled more than six hundred flights. In addition…snow and blowing snow produced near zero visibilities…forcing officials to close the westbound lanes of Interstate 70…between the Kansas state line and Denver… as well as the eastbound lanes from Denver to Limon. Other road closures included State Highway 86…between Kiowa and I-70. Across the Urban Corridor storm totals included: 22 inches in Broomfield; 21 inches at Lafayette…Louisville and Westminster; 20 inches at Northglenn; 19 inches at the National Weather Service in Boulder…Castle Rock… Centennial and Parker; 18 inches in Arvada…16.5 inches in Erie… 13.5 inches near Longmont; 11 inches in Lyons and 10 inches in Frederick. Storm totals in the mountains and foothills included: 51 inches at Coal Creek Canyon…45.5 inches… 4.6 miles northeast of Ward; 44.5 inches…3 miles west of Jamestown; 38 inches… 3 miles north of Blackhawk; 37 inches…3 miles west-southwest of Conifer and 4 miles east-northeast of Nederland; 35.5 inches… 3.6 miles west-northwest of Boulder; 34 inches…5.2 miles east-southeast of Aspen Springs; 33 inches near Evergreen…32 inches at Genesee; 31 inches…10.3 miles west of Bellvue and Eldora Mountain Ski Resort; 24 inches at Echo Mountain Ski Resort; 21 inches at Niwot Ridge SNOTEL; and 19 inches at Gross Reservoir. Along the Palmer Divide storm totals included: 26 inches…14 miles east-northeast of Kiowa; 25 inches…10 miles south-southwest of Buckley Air Force Base…and 8 miles southeast of Watkins; 20 inches near Strasburg; 12 inches near Elizabeth.

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In 1906…northeast winds were sustained to 43 mph behind a cold front on the 3rd. The front plunged temperatures from a high of 62 degrees on the 3rd to a low of 24 degrees…which was also the high reading on the 4th. The low temperature on the 4th was only 3 degrees. Snowfall was only 0.6 inch on the 4th.

In 1970…a wind gust to 115 mph was recorded in Boulder at the National Center for Atmospheric Research. Sustained winds of 35 mph with gusts as high as 62 mph were measured in downtown Boulder. Northwest winds gusted to 47 mph at Stapleton International Airport on the 3rd.

In 2020…a storm system produced period of moderate to heavy snowfall in and near the Front Range Foothills. A spotter near Eldorado Springs measured over 21 inches of snow…with 12 inches observed in Sunshine Canyon. Elsewhere…storm totals ranged from 6 to 11 inches. Along the urban corridor…storm totals west of I-25 ranged from 5 to 8 inches…with 2 to 4 inches east of the interstate. At Denver International Airport…2.8 inches of snowfall was observed.

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In 1982…a cold surge of arctic air brought light snow and sub-zero temperatures to metro Denver. Temperatures plunged to 6 below zero at midnight on the 3rd and never warmed above zero on the 4th as snow flurries continued. High temperature on the 4th of 1 below zero was a record low maximum. The temperature dipped to a record low of 15 below zero on the 5th.

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In 1883…the temperature plunged to a low of 22 degrees below zero.

In 1885…a windstorm occurred in the city during the afternoon and early evening. West winds sustained to 64 mph blew down several trees…chimneys…awnings… And sheds. Stronger winds in the foothills blew a train from the track at Georgetown…injuring several passengers.

In 1890…the highest recorded temperature in February… 77 degrees…occurred. This temperature was equaled on February 28…2006.

In 1898…west winds were sustained to 53 mph with gusts to 60 mph.

In 1915…very strong northwest winds whipped downtown Denver nearly all day. There were 13 consecutive hours with maximum sustained velocities ranging from 27 to 44 mph. An extreme velocity to 46 mph was recorded.

In 1952…a northwest wind gust to 48 mph was recorded at Stapleton Airport. Severe winds were reported west and north of Denver.

In 1995…high winds developed in the foothills west and northwest of Denver. A gust to 97 mph was recorded on Squaw Mountain. Winds were clocked to 83 mph at Rollinsville. Wind gusts between 50 and 70 mph were common. North winds gusted to only 31 mph at Stapleton International Airport.

Continue reading February 4 to February 10: This week in Denver weather history