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

This Week in Denver Weather History

As we have seen in recent days, Old Man Winter oftentimes makes his appearance in earnest during the month of Denver. Looking back at this week in Denver weather history we can see that is not at all unusual.

From the National Weather Service:

1-5

In 1913…the 1st marked the start of the heaviest 5-day total snowfall in the city’s history. During this period snowfall totaled 45.7 inches. Starting on the 1st…snow fell intermittently for 3 days and accumulated a little over 8 inches. On the 4th and 5th…an additional 37.4 inches of snow fell. At Georgetown in the foothills west of Denver even more snow fell…86 inches over the 5 days with the most…63 inches…on the 4th. In Colorado…snowfall was heavy along the eastern slopes of the mountains from the Palmer Divide north. High winds during the storm caused heavy drifting…which blocked all transportation. Snow cover of an inch or more from the storm persisted for 60 consecutive days from the 1st through January 29…1914. Additional snowfall in December and January prolonged the number of days. This is the third longest period of snow cover on record in the city.

2-4

In 1909…post-frontal snowfall totaled 6.1 inches in downtown Denver. Most of the snow…5.9 inches…fell between 6:00 pm on the 2nd and 6:00 pm on the 3rd. North winds were sustained to 18 mph on both the 2nd and 3rd.

2-17

In 1939…more than 2 weeks of unseasonably warm weather made the month the 3rd warmest on record. Seven daily temperature records were set…including the all time record high temperature for the month of 79 degrees on the 5th. Daytime highs were balmy with 14 days in the 60’s and 70’s. Low temperatures dipped to freezing or below on only 5 days. The period was dry with only a trace of snow on the 12th.

3-4

In 1968…strong Chinook winds in Boulder gusting to 52 mph downtown caused 7 thousand dollars in damage. Flying debris damaged cars…houses…and other property in Boulder. West winds gusted to 49 mph late on the 3rd and to 45 mph on the 4th at Stapleton International Airport where the temperature climbed to a high of 60 degrees on the 4th.

In 1970…strong winds whistled through Boulder. Sustained winds of 40 mph with gusts to 70 mph were recorded at the National Bureau of Standards in Boulder. Wind gusts to 50 mph occurred in downtown Denver. No damage was reported. On the 3rd…northwest winds gusted to 40 mph at Stapleton International Airport where the Chinook winds warmed the temperature to a high of 66 degrees on the 4th.

In 1999…heavy snow fell over the foothills and metro Denver. The heaviest snowfall occurred in the foothills south of I-70 and near the Palmer Divide. Snowfall totals included: 25 inches near Tiny Town; 18 inches at Conifer; 15 inches near Evergreen; 14 inches at Chief Hosa…8 miles west of Castle Rock…and near Blackhawk; 12 inches at Pine Junction and 8 miles south of Sedalia; 11 inches atop Floyd Hill and in Roxborough; and 10 inches at Castle Rock. Around metro Denver…snowfall totals included: 10 inches at Highlands Ranch…9 inches at Parker…and 8 inches in Aurora and Wheat Ridge. Elsewhere around the metro area…snowfall generally ranged from 3 to 5 inches. Only 3.2 inches of snow fell at the site of the former Stapleton International Airport. North winds gusted to 32 mph at Denver International Airport on the 3rd.

In 2007…high winds developed in and near the Front Range foothills. Peak wind reports included: 88 mph atop Niwot Ridge; 87 mph atop mines peak; 80 mph…3 miles southeast of Jamestown; 78 mph at Longmont; 74 mph at Table Mesa. A few power outages occurred in Longmont as broken branches downed power lines. Northwest winds gusted to 38 mph at Denver International Airport on the 4th.

In 2013…a storm system brought heavy snow to parts of the Front Range Foothills. Storm totals included: 12 inches…7 miles west-southwest of Evergreen; 10.5 inches…3 miles north of Bailey; 9.5 inches…3 miles west of Jamestown and 5 miles northeast of Ward; 9 inches in Bailey…8.5 inches… 3 miles north of Conifer.

3-15

In 1972…a protracted cold spell held an icy grip on metro Denver when maximum temperatures never reached above freezing for 10 consecutive days from the 3rd through the 12th and minimum temperatures dipped below zero on eleven consecutive days from the 5th through the 15th. Daily low temperature records were set with 15 degrees below zero on the 5th…17 degrees below zero on the 6th… And 18 degrees below zero on the 10th. Daily record low maximum readings were set with 3 degrees on the 6th and 6 degrees on the 9th. The very cold temperatures were caused by 3 to 5 inches of snow cover and a Canadian air mass.

4

In 1884…a windstorm during the afternoon produced sustained northwest winds to 34 mph with higher gusts. The strong wind blew one of the wooden slats from the weather instrument shelter…which broke the wet-bulb thermometer.

In 1885…north winds were sustained to 40 mph during the early morning hours. The strong winds were accompanied by a cold wave.

In 1893…northwest winds were sustained to 48 mph with gusts as high as 55 mph. The Chinook winds warmed the temperature to a high of 58 degrees.

In 1901…Chinook winds sustained from the northwest at 40 mph with gusts to 48 mph warmed the temperature to a high of 55 degrees in the city.

In 1906…rainfall of only 0.01 inch before daybreak was the only measurable precipitation of the month…ranking the month the third driest December on record.

In 1910…cold west winds were strong all day with a sustained speed to 44 mph.

In 1977…northwest winds gusted to 55 mph at Stapleton International Airport where the strong Chinook winds warmed the temperature to a high of 55 degrees.

In 1978…high winds from 50 to near 150 mph occurred in the Boulder area. A pick-up truck was overturned…and a camper top was blown off another truck. Some roof damage was reported. Northwest winds gusted to 48 mph at Stapleton International Airport…where the Chinook winds warmed the temperature to a high of 57 degrees.

In 1980…wind gusts of 50 to 60 mph occurred along the foothills. Southwest winds gusted to 31 mph at Stapleton International Airport. The Chinook winds warmed the temperature to a record high of 69 degrees for the day.

In 1991…a volcanic ash cloud high in the atmosphere was clearly visible during the late afternoon being illuminated by the setting sun.

In 1995…very strong downslope winds gusting to 100 mph in the foothills knocked down trees and power lines… Triggering 800 power outages. Downed power lines sparked a half dozen brush fires ranging up to 4 acres in size. In Boulder…a portion of an old drive-in movie screen was blown down…and several car windows were shattered. The strongest wind gusts recorded were 100 mph at Golden Gate Canyon…99 mph at Rocky Flats Environmental Technology site…96 mph in north Boulder…94 mph at Wondervu…81 mph at Conifer…and 77 mph in south Boulder. West-northwest winds gusted to only 29 mph at Denver International Airport.  Continue reading December 4 to December 10: This week in Denver weather history

Thornton’s December 2022 preview: Winter arrives, typically with cold and snow

Thornton, Colorado's December Weather Preview

Recent months have, overall, been warmer and drier than normal.  Last month saw a notable turn toward colder than normal temperatures and more snow than usual.  What will December hold for us?

The month of December brings with it the official start of winter and oftentimes, colder and snowier weather conditions.

It however can also offer unseasonably warm temperatures and bone dry conditions.  Given our recent mild and dry weather, we are certainly hoping for a change in the coming month.

Overall December’s monthly mean temperature of 30.0 degrees (1981 – 2010 averages) makes it our coldest month.  Snow is always on everyone’s mind this time of year but December is only our 3rd snowiest month behind March and November with an average of 8.5 inches of the white stuff.

Get all the details on Thornton’s December weather including a look back at historical events and a look at the long range forecast in our December weather preview here.

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November 2022 weather recap: A very cold, somewhat snowy month

November 2022 Temperature Summary for Thornton, Colorado. (ThorntonWeather.com)
November 2022 Temperature Summary for Thornton, Colorado. (ThorntonWeather.com)

Brrr! That would be the operative “word” for the month of November 2022. Despite forecasts of above normal temperatures for the month, we saw very little of that and in fact, saw Thornton’s coldest November of the past 16 years.

The month started out warm enough with back to back days of 70+ degrees. However, after that, we went downhill for much of the month. Only eight days of the month saw above average temperatures. The balance was below. Sometimes well below.

Thornton’s average temperature for the month came in at 34.3 degrees. That was far below Thornton’s 16-year running November average of 39.5 degrees and Denver’s long term average for the month of 39.4 degrees. Officially, as measured at the airport, the Mile High City was a bit warmer with an average of 35.6 degrees.

Thornton’s reading ranked the month as the coldest November of the past 16. The next closest was November 2014 with an average of 35.0 degrees. Denver’s average actually put November 2022 into the record books with a tie for the 19th coldest November on record.

Our warmest reading of the month was 74.1 degrees, coming on the first of the month. Our coldest reading came on the last morning of November at 8.3 degrees. Denver’s highest and lowest were 75 degrees and 4 degrees, coming on the same dates.

In terms of precipitation, it wasn’t an overly wet month with the snows being relatively dry. Thornton recorded 0.54 inches of precipitation for the month. Denver saw less with 0.47 inches. Thornton’s 16-year running November average is 0.49 inches. Denver’s long term November average is 0.64 inches.

As for the white stuff, Thornton recorded a healthy 12.8 inches, well above the 5.7 inches that November has averaged over the last 16 years. Denver lagged us with 10.9 inches. The Mile High City’s November average since 1882 is 7.4 inches.

Click here to view Thornton’s complete November 2022 climate summary report.

November 2022 Precipitation Summary for Thornton, Colorado. (ThorntonWeather.com)
November 2022 Precipitation Summary for Thornton, Colorado. (ThorntonWeather.com)

November 2022 top shots: Monthly photo slideshow

A barn settled in among the fading fall colors. (Bill Hutchinson)
A barn settled in among the fading fall colors. (Bill Hutchinson)

Typically November is a quiet weather month with plenty of nice, fall days but it can also turn wet with healthy doses of snow and moisture.  The wide variety of conditions can create picturesque scenes ranging from blue skies and snow-capped mountains to a wintry wonderland in the metro area.

November is the second snowiest month of the year so winter conditions are not unusual.  Typically though, these bouts of cold are short-lived and normal daytime conditions are pleasant.

Outdoor activities continue to be quite popular during the month.  The cooling temperatures do oftentimes lead to an increase in wildlife activity.

All of the above help lead to a month in which a wide variety of scenes, flora and fauna can be captured.

  • Slideshow updated November 30, 2022
  • To learn more about how to send your photo to us for inclusion in the slideshow, see below the slideshow.

Showcasing images captured by ThorntonWeather.com readers as well as some of our own, our monthly slideshow covers the entire gamut of weather-related imagery.

Sunsets, sunrises, wildlife and of course every type of weather condition are vividly depicted in images captured from yours and our cameras.

[flickr_set id=”72177720303574652″]

What is missing in the slideshow above?  Your photo!

Our monthly photo slideshow is going to feature images that we have taken but more importantly images that you have captured.  The photos can be of anything even remotely weather-related.

Landscapes, current conditions, wildlife, pets, kids.  Whimsical, newsy, artsy.  Taken at the zoo, some other area attraction, a local park, a national park or your backyard.  You name it, we want to see and share it!

Images can be taken in Thornton, Denver or anywhere across the extraordinary Centennial State.  We’ll even take some from out of state if we can tie it to Colorado somehow.

We’ll keep the criteria very open to interpretation with just about any image eligible to be shown in our slideshows.

What do you win for having your image in our slideshow?  We are just a ‘mom and pop’ outfit and make no money from our site so we really don’t have the means to provide prizes.  However you will have our undying gratitude and the satisfaction that your images are shared on the most popular website in Thornton.

To share you images with us and get them included in the slideshow just email them to us or share them with ThorntonWeather.com on any of the various social media outlets.  Links are provided below.

So come on, get those camera’s rolling!

November 27 to December 3: This Week in Denver Weather History

This Week in Denver Weather History

Cold, snow and wind are the dominant conditions we see in our look back at this week in Denver weather history. All three are common this time of year and extremes with those conditions seem to be unusually common as well.

Among the highlights are numerous high wind events that not only caused damage but also injury to unprepared residents. Significant snowfall also appears many times including a storm in 1983 that shut down the city for the Thanksgiving weekend and left snow on the ground for 63 days.

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From the National Weather Service:

25-27

In 1978…heavy snowfall of 6.0 inches was measured at Stapleton International Airport where north winds gusted to 20 mph. Most of the snow…4.8 inches…fell on the 25th. The greatest amount of snow measured on the ground was 5 inches due to settling and melting.

25-28

In 1952…the average coldest 4-day period in November in the previous 81 years of record occurred. Maximum temperatures of 19…15…21…and 25 degrees were recorded. Minimum temperatures were below zero each day with readings of 7 below…6 below…5 below…and 6 below.

25-29

In 1985…dense fog with visibilities as low as 1/8 mile occurred on five consecutive days at Stapleton International Airport. The fog was at times accompanied by light snow… Light freezing drizzle…or ice crystals. Fog occurred all day on both the 26th and 29th.

26-27

In 1876…heavy snowfall totaled 9.0 inches over the city from 5:00 pm on the 26th through 5:00 p.m. on the 27th. Precipitation was 0.30 inch on the 25th and 0.60 inch on the 27th.

In 1919…an incursion of cold arctic air produced snowfall of 4.6 inches over downtown Denver. Temperatures dipped to 5 degrees below zero on the evening of the 26th and recovered to a high of only 1 degree below zero on the 27th…the all-time record low maximum for the month of November and the record for the date. Northwest winds were sustained to 25 mph with gusts to 26 mph on the 26th.

In 1923…snowfall of 2.0 inches was the only snow of the month. North winds were sustained to 22 mph on the 26th.

In 1972…heavy snowfall totaled 7.5 inches at Stapleton International Airport where north winds gusted to only 18 mph on the 27th.

In 1983…a Thanksgiving blizzard dumped 21.5 inches of snowfall in 37 hours with a maximum of 18 inches on the ground at Stapleton International Airport. The storm produced howling winds…which paralyzed Thanksgiving weekend transportation across all of eastern Colorado. On the 27th…Stapleton International Airport closed… Opening 24 hours later. Interstate highways were closed in all directions…but west…from Denver. At Stapleton International Airport…north winds gusted to 36 mph on the 26th and to 29 mph on the 27th. However…most wind speeds across metro Denver were 15 to 30 mph. Temperatures hovered in the teens and lower 20’s. Many stores and businesses closed. Several high school football games were postponed. Across metro Denver…snow depth varied from 15 inches in Commerce City to 28 inches near Chatfield Reservoir. Snow removal in Denver was estimated at 1.5 million dollars. Following the storm… An inch or more of snow remained on the ground for 63 consecutive days through January 27…1984. This is the longest period of continuous snow cover ever recorded in Denver.

In 1990…an early winter storm deposited 2 to 8 inches of wet snow across metro Denver. Snowfall totaled 3.4 inches at Stapleton International Airport where northeast winds gusted to 30 mph on the 26th.

In 1993…strong winds swept off the foothills across metro Denver. Sustained winds of 30 to 50 mph were common across the area. Wind gusts to 67 mph were recorded atop Squaw Mountain near Idaho Springs. West winds gusted to 36 mph at Stapleton International Airport on the 26th. The strong winds produced some blowing snow…reducing the visibility to less than one mile at times.

In 1995…snowfall totaled 3.7 inches at the former Stapleton International Airport site. The foothills west of Denver received 4 to 7 inches of snow. North-northeast winds gusted to 34 mph at Denver International Airport on the 26th.

27

In 1965…strong winds buffeted Boulder…causing 11 thousand dollars in damage. Wind gusts to 75 mph were recorded downtown. West winds gusted to 38 mph at Stapleton International Airport.

In 1994…winds gusted to 87 mph atop Squaw Mountain…5 miles south of Idaho Springs…and to 84 mph on Fritz Peak near Rollinsville in the foothills southwest of Boulder. Northwest winds gusted to 40 mph at Stapleton International Airport.

In 2017…The maximum temperature for Denver reached 81 degrees which was 34 degrees above the normal high of 47 degrees. This difference between the actual high and the normal high was the second largest ever recorded for Denver. The only larger difference occurred on Dec 5…1939 when Denver was 35 degrees above normal. It also established a new record for the latest 80 degree day for the calendar year in Denver… breaking the previous date by 11 days.

28

In 1884…a windstorm during the afternoon produced northwest sustained winds to 46 mph. Two wooden slats were blown out of the weather instrument shelter…and nearly all of the slats on the north and west sides were loosened.

In 1898…northwest winds were sustained to 50 mph with gusts as high as 80 mph.

In 1902…northwest winds were sustained to 40 mph with gusts to 48 mph. The strong apparent Bora winds warmed the temperature to a high of only 40 degrees.

In 1904…northwest winds sustained to 44 mph with gusts to 58 mph warmed the temperature to a high of 58 degrees.

In 1927…strong west winds occurred in Boulder…causing widespread minor damage. A wind gust to 65 mph was recorded at Valmont east of Boulder. The west winds possibly produced a cyclonic twist.

In 1928…heavy snowfall totaled 7.0 inches over downtown Denver.

In 1957…a vigorous cold front produced north-northeast wind gusts to 54 mph at Stapleton Airport. Light snow following the front totaled only 0.2 inch.

In 1970…strong Chinook winds reached 77 mph in downtown Boulder.

In 1978…wind gusts 60 to 90 mph were reported in and near the foothills.

In 1984…high winds of 60 to 80 mph occurred along the Front Range eastern foothills.

In Boulder…the high winds blew the roof off a service station. Several trees were felled… Damaging some cars. An elderly woman was injured when she was knocked down by a wind gust and blown 20 feet into some bushes. Northwest winds gusted to 36 mph at Stapleton International Airport.

In 1994…winds gusted to 72 mph in Boulder. No damage was reported. Northwest winds gusted to 35 mph at Stapleton International Airport. Continue reading November 27 to December 3: This Week in Denver Weather History

November 20 to November 26: This Week in Denver Weather History

This Week in Denver Weather History

With the Thanksgiving holiday approaching, travelers cast a wary eye on Denver’s weather and in our look back at this week in Denver weather history we see they have had cause for concern in the past. Snowstorms and wind have caused their share of problems. Also notable, it was 140 years ago that Denver’s first official weather observation occurred.

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From the National Weather Service:

18-20

In 1930…a major storm dumped a total of 13.6 inches of snowfall over downtown Denver. Most of the snow…9.4 inches…fell on the 19th when north winds were sustained to 23 mph. This was the only measurable snow of the month. Temperatures hovered in the 20’s and lower 30’s.

In 1956…an intense winter storm dumped 12.8 inches of snowfall on metro Denver. Strong north-northeast winds gusting to 33 mph at Stapleton Airport frequently reduced the visibility to 1/2 mile in snow and blowing snow on the 19th. Most of the snowfall…10.7 inches…occurred on the 19th.

19-21

In 1979…a heavy snowstorm buried most of Colorado under at least a foot of snow. Snowfall at Stapleton International Airport totaled 17.7 inches…the greatest snow depth since 1946. Winds to 60 mph produced 5-foot drifts paralyzing the city as temperatures hovered in the 20’s. While small airports closed…Stapleton remained open…but with long delays that snarled thanksgiving holiday traffic. Schools and businesses closed and postal deliveries were delayed. Almost all major highways leading out of Denver were closed to traffic for periods of time on the 20th and 21st. Most of the snow…13.5 inches…fell on the 20th. At Stapleton International Airport…north winds gusted to 35 mph on the 20th and to 38 mph on the 21st.

20

In 1871…the first official weather observation in Denver… Was taken by Henry Fenton…observer sergeant of the united states army signal service at 5:43 am. The office was located on the 2nd floor of a building at the corner of Larimer and g streets…now 16th street. The daily weather journal hand written entry for the day follows: “Snow fell heavily during past night. At 5:43 am it was snowing light and continued until 8 am. Wind during snow storm gentle and a little west of south…and continued there during the remainder of the day. Sky clear after 8 am. Very cold weather prevailed all day and night. Thermometer at 9:43 pm 14 degrees. Rain gauge and self-registering thermometer not in position owing to severe storm last week. Barometer falling during the morning and rising rapidly at night.”

In 1894…northwest Chinook winds sustained to 40 mph with gusts to 45 mph warmed the temperature to a high of 58 degrees in the city.

In 1909…steady and very strong winds in Boulder caused 3 thousand dollars in damage.

In 1915…post-frontal northeast winds sustained to 40 mph with gusts as high as 42 mph produced only a trace of snow. It was windy most of the day.

In 1923…west winds were sustained to 42 mph with gusts to 44 mph before daybreak. The strong winds persisted in the city for only about 3 hours.

In 1993…a wind gust to 72 mph was recorded at Table Mesa in southwest Boulder.

In 1994…winds gusted to 77 mph atop Squaw Mountain west of Denver. West winds gusted to 40 mph at Stapleton International Airport.

20-21

In 1898…snowfall totaled 4.0 inches in downtown Denver. Northeast winds were sustained to 48 mph with gusts as high as 60 mph behind an apparent cold front on the 20th… When temperatures plunged from a high of 66 degrees to a low of 9 degrees. On the 21st the high was only 24 degrees and the low was 2 degrees.

In 1970…a wind gust to 94 mph was recorded at gold hill in the foothills west of Boulder. Strong winds also swept across metro Denver. Wind gusts reached 59 mph in downtown Boulder…while at Stapleton International Airport west- northwest winds gusted to 43 mph on the 21st. Damage was minor.

In 1992…a large Canadian air mass moved into the state at the same time an upper level storm system approached from the west. The combination of cold air at the surface and very moist air aloft produced heavy snow across the entire state. Snowfall totaled 6.3 inches at Stapleton International Airport…where north winds gusted to 23 mph on the 20th. Snow was heavier in the foothills…with 14 inches at Wondervu…13 inches at Aspen Springs…Conifer… Boulder…and Gross Reservoir…8 inches at Rollinsville… And 10 inches at Golden Gate Canyon and Morrison.

In 2007…a storm system brought moderate to heavy snowfall to portions of the urban corridor. Storm totals included: 7 inches…3 miles south-southeast of Fort Collins…with 6 inches in Boulder and at Horsetooth Inlet Bay. Elsewhere… Storm totals ranged from 2 to 5 inches. Snowfall totaled 2.0 inches at the site of the former Stapleton International Airport. Continue reading November 20 to November 26: This Week in Denver Weather History

November 13 to November 19: This week in Denver weather history

This Week in Denver Weather History

Wind and snow are two hallmarks of Denver’s November weather and we see an abundance of those events in our look back at this week in Denver weather history. Damaging wind makes numerous appearances as does wintry weather.

From the National Weather Service:

10-13

In 2014…an Arctic cold front associated with a strong storm system over the northern Rockies blasted into northeastern Colorado.  The temperature in Denver plummeted from the high of 64 degrees at 4:37 pm to 34 degrees by 5:53 pm.  The temperatures continued to fall and dropped into the teens by early evening.  The Arctic airmass remained entrenched over the region…with the high temperatures failing to reach the teens from the 11th through the 13th.  This was the first time since records have been taken in Denver…dating back to 1872…that there were three consecutive days with the maximum temperatures remained below 20 degrees in the month of November.  In addition to the frigid temperatures…0.1 inch of snowfall was observed on 11th at Denver International Airport…which marked the first measureable snowfall for the season. An additional 2.2 inches of snowfall was measured on the 12th.  Several temperature records were broken.  A record low max of 16 degrees on the 11th broke the previous record of 19 set back in 1916.  A record low max of 6 degrees on the 12th broke the previous record of 9 degrees…also set in 1916.  The record low of -13 on the 12th…shattered the previous record of -4 degrees set back in 1872.  Even more impressive…the record low of -14 degrees on the 13th broke the previous record of -3 degrees set back in 1916.

11-14

In 1970…heavy snowfall totaled 7.2 inches at Stapleton International Airport where northeast winds gusted to 22 mph on the 12th and 14th. Most of the snow… 4.2 inches…fell on the 12th.

12-13

In 1961…heavy snowfall totaled 5.6 inches at Stapleton Airport. East-northeast winds gusted to only 20 mph.

In 2011…hurricane force winds…up to 115 mph… downed trees in and power lines across the Front Range Mountains and Foothills. Scattered outages were reported in Gilpin County.  In Boulder…a woman received minor injuries when she was struck in the head by a falling tree limb. Three women near Georgetown received minor injuries when they were pelted by glass shards after a barrage of wind driven rocks and dirt shattered their windshield. Peak wind gusts included: 109 mph…6 miles north-northwest of Berthoud Pass; 101 mph atop Kenosha Pass…100 mph… 2 miles south-southwest of Loveland Pass; 99 mph…7 miles west-northwest of Berthoud; 92 mph at Blackhawk; 90 mph…3 miles south-southwest of Boulder; 87 mph…2 miles west-northwest of Aspen Springs and at Pickle Gulch; 84 mph at Loveland Pass and Lyons; 82 mph at the National Wind Technology Center; 80 mph at Dumont and 78 mph near Rollinsville and Ward. At Denver International Airport…west winds gusted to 52 mph on the 12th.

12-15

In 1909…light snowfall totaled 6.7 inches in downtown Denver over the 4 days. This was the first measurable snowfall of the season. Northeast winds were sustained to 15 mph on the 12th.

13

In 1951…northwest wind gusts to 50 mph were recorded at Stapleton Airport.

In 1983…winds gusted to around 60 mph in and near the foothills. There were scattered power outages and a few broken windows across metro Denver. The strong winds did 10 thousand dollars in damage to awnings at the Brown Palace Hotel in downtown Denver. West winds gusted to 46 mph at Stapleton International Airport.

13-14

In 1925…heavy post-frontal snowfall totaled 6.4 inches overnight in downtown Denver. Northwest winds were sustained to 27 mph with gusts to 29 mph on the 13th.

In 1974…northwest winds gusted to 52 mph at Stapleton International Airport…warming the temperature to 60 degrees shortly after midnight on the 13th. A cold front cooled temperatures into the 20’s by late morning and produced snowfall of 3.7 inches. The low temperature dipped to 14 degrees on the 14th.

In 1993…an upper level low pressure system combined with a weak but moist upslope flow to produce heavy snow across metro Denver. Snowfall amounts averaged 6 to 8 inches with up to 16 inches in the foothills at the Eldora Ski Area. Snowfall totaled 6.0 inches at Stapleton International Airport where north winds gusted to only 20 mph on the 14th. Most of the snow fell on the 14th.

In 1994…heavy snow developed rapidly along the Front Range urban corridor with the heaviest snow over northwest metro Denver. Sixteen to 18 inches of snow fell in Boulder… Lafayette…and Louisville. This was the second heavy snowfall over northwest metro Denver in 10 days. Eleven to 14 inches of snow were measured from Longmont southward into Aurora. Snowfall totaled 12.1 inches at Stapleton International Airport where northeast winds gusted to 29 mph on the 13th. Most of the snow…9.0 inches…fell on the 14th.

In 1997…heavy snow fell overnight in portions of Jefferson and Boulder counties. About 5.5 inches of snow were reported in Boulder…while 4 inches were measured 12 miles southwest of Morrison and 6 miles southwest of Golden. Snowfall totaled only 1.8 inches at the site of the former Stapleton International Airport. Northeast winds gusted to 26 mph at Denver International Airport.

14

In 1874…west winds blew at gale speeds from midnight until mid afternoon when the winds abated. The maximum sustained velocity was 48 mph.

In 1928…strong winds caused 3 hundred to 5 hundred dollars damage in Boulder. Wind gusts to 70 mph were recorded at Valmont just east of Boulder.

In 2006…an upper level jet stream combined with a high surface pressure gradient behind a cold front to produce strong winds across metro Denver. A wind gust to 66 mph was recorded in Longmont. North winds were sustained to 38 mph with gusts to 52 mph at Denver International Airport where winds were strong and gusty most of the day.

In 2020…a peak wind gust to 60 mph was observed from the northwest at Denver International Airport…with a peak gust to 55 mph at Centennial Airport.

14-15

In 1917…overnight rainfall was 0.03 inch. This was the only measurable precipitation of the month…making it the 5th driest November on record.

In 1985…3 to 6 inches of snow fell across metro Denver. Snowfall totaled 3.8 inches at Stapleton International Airport where northeast winds gusted to only 13 mph.

In 2005…a winter storm that brought heavy snow to the mountains also spread heavy snow into the foothills to the west of Denver. Snowfall totals included: 14 inches at Aspen Springs…13 inches near Pinecliffe…and 12 inches near Nederland. Interstate 70 along with U.S. Highway 40 had to be closed near Idaho Springs due to snow…poor visibility in blowing snow…numerous accidents…and an increased avalanche danger. High winds were recorded in the foothills on the 14th. Winds gusted to 89 mph at Georgetown and to 91 mph on Sugarloaf Mountain west of Boulder. Strong microburst winds associated with a dissipating rain shower gusted to 61 mph at Denver International Airport on the 14th.

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

In 1902…4.0 inches of snow fell over downtown Denver. This was the only measurable snow of the month. Northeast winds were sustained to 18 mph with gusts to 20 mph.

In 1906…strong winds howled and roared across Boulder… Causing several thousand dollars in damage. The strong winds caused one fatality and minor injuries to others. West winds were sustained to 46 mph in downtown Denver where the strong Chinook winds warmed the temperature to a high of 74 degrees.

In 1944…the low temperature dipped to 32 degrees. This is the latest date of the first freeze in Denver.

In 1949…a trace of rain fell. Another trace of rain on the 11th was the only precipitation of the month…making the month one of the driest Novembers on record and the least snowiest with no snow. This was the first November since 1882 without snow.

In 1960…strong winds caused 2 thousand dollars damage to a new school building in Boulder where wind gusts were estimated to 70 mph. Wind gusts to 40 mph were recorded in downtown Denver. Damage occurred to utility lines…signs… And trees. Northwest winds gusted to 44 mph at Stapleton Airport.

In 1986…strong Chinook winds howled over the Front Range foothills. The highest wind gust…81 mph…was recorded at Table Mesa in Boulder. West winds gusted to 31 mph at Stapleton International Airport.

In 1987…the first measurable snow of the season was also a major snowstorm. The snow combined with strong winds to close I-70 east of Denver and I-25 to Colorado Springs. Snow accumulations ranged from 6 to 9 inches across metro Denver with 10 to 20 inches in the foothills. At Stapleton International Airport…6.1 inches of snow fell and north winds gusted to 47 mph reducing the visibility to as low as 1/8 mile in heavy snow. Strong north winds at 20 to 30 mph with frequent gusts to 40 mph and temperatures hovering around 30 degrees plunged wind chill temperatures to 5 below zero.

In 1988…the season’s first snow storm hit metro Denver. The storm dumped 2 to 5 inches of snow…which caused numerous traffic snarls and accidents. North wind gusts to 43 mph caused some blowing snow. Snowfall totaled 2.5 inches at Stapleton International Airport. This was the latest first snow of the season. No traces of snow had occurred earlier in the season.

In 2010…the combination of light snow…wind…black ice and careless driving resulted in a 34-vehicle crash along Interstate 25 north of Monument. Five tractor-trailers were involved in the pileup. Although there were no fatalities… 18 people were seriously injured and taken to nearby hospitals. The northbound lanes of I-25 were closed for several hours…snarling the traffic between Denver and Colorado Springs.

Continue reading November 13 to November 19: This week in Denver weather history

November 6 to November 12: This Week in Denver Weather History

This Week in Denver Weather History

Our look back at this week in Denver weather history is dominated with two types of events: snow and wind. November is our second snowiest month and we see many significant snowfall events in the past. Wind is a fact of life on the plains and in Denver and damaging events have occurred with relatively frequency as we can see below.

From the National Weather Service:

5-6

In 1938…heavy snowfall totaled 7.5 inches over downtown Denver. North winds were sustained to 16 mph with gusts to 19 mph on the 5th.

5-7

In 1918…rain was mixed with and changed to snow…which became heavy and totaled 8.1 inches in downtown Denver. North winds were sustained to 21 mph with gusts to 23 mph.

6

In 1962…west winds gusted to 55 mph…briefly reducing the visibility to 1 1/2 miles in blowing dust at Stapleton Airport. The strong winds blew all day.

In 1989…high winds to 62 mph were recorded in Boulder. Northwest winds gusted to 33 mph at Stapleton International Airport.

In 1991…strong westerly Chinook winds blew into metro Denver with gusts to 88 mph recorded at Rollinsville and to 51 mph in Boulder. Later…northeast winds with gusts of 30 to 40 mph were common across all of metro Denver behind a cold front…which produced only 0.2 inch of snowfall at Stapleton International Airport.

7

In 1958…a strong cold front produced northeast wind gusts to 52 mph at Stapleton Airport where some blowing dust was observed.

In 1980…Chinook winds at sustained speeds of 40 mph were recorded with a peak gust to 71 mph measured at Wondervu southwest of Boulder. West winds gusted to 25 mph at Stapleton International Airport.

In 1989…strong winds buffeted many foothills areas. Wind gusts of 60 to 70 mph were recorded in Boulder and Longmont. Northwest winds gusted to 43 mph at Stapleton International Airport.

In 1996…wind gusts to 75 mph were recorded at Golden Gate Canyon and at the Rocky Flats Environmental Test Facility northwest of Denver. Northwest winds gusted to 40 mph at Denver International Airport.

In 1998…upslope conditions…coupled with a moist and unstable air mass…allowed heavy snow to develop in the foothills west of Denver. Snowfall generally ranged from 4 to 6 inches…but 7 inches were measured 4 miles south of Evergreen. Only 1.2 inches of snow fell at the site of the former Stapleton International Airport. This was the first measurable snow of the season.

7-8

In 1969…wind gusts to 48 mph in downtown Boulder caused minor damage.

8

In 1896…southwest Chinook winds sustained to 42 mph with gusts as high as 46 mph warmed the temperature to a high of 53 degrees.

In 1977 near-blizzard conditions in blowing snow caused the closure of I-70 to the west of Denver in clear creek canyon and east of Denver to Limon. Northeast wind gusts to 46 mph were recorded at Stapleton International Airport where snowfall totaled only 1.1 inches.

In 1984…a rare November thunderstorm produced west winds gusting to 31 mph…but only 0.04 inch of rain at Stapleton International Airport.

In 1996…high winds gusting from 80 to 100 mph were recorded at Wondervu in the foothills southwest of Boulder. West northwest winds gusted to 32 mph at Denver International Airport.

In 2006…the temperature in Denver climbed to a high of 80 degrees. This was the first time the temperature had ever exceeded the 70’s in November since records began in 1872. This new all-time record maximum temperature for the month of November was also a new daily record and the highest temperature ever recorded so late in the season.

In 2020…a peak wind gust to 63 mph was observed at Centennial Airport from the southwest. At Denver International Airport…a peak gust to 53 mph was observed.

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.

10-11

In 1911…a strong cold front produced snow and a cold wave. The temperature dropped 68 degrees from a high of 66 degrees at 12:40 pm on the 10th to a low of 2 degrees below zero at 7:15 am on the 11th. The low temperature of 23 degrees at midnight on the 10th was also the high temperature on the 11th. Northeast winds were sustained to 42 mph with gusts to 51 mph. Snowfall was only 2.5 inches.

In 1982…up to 4 inches of snow fell over the higher terrain between Denver and Colorado springs. Winds gusted to 50 mph along the foothills. Rainfall totaled 0.27 inch with only 0.1 inch of snow on the 11th at Stapleton International Airport where north winds gusted to 39 mph. Dense fog with visibilities as low as zero persisted all day on the 10th. Continue reading November 6 to November 12: This Week in Denver Weather History

Total lunar eclipse to turn the moon red on Election Day 2022

November 8. 2022 Total Lunar Eclipse Time and Phases. (NASA)
November 8. 2022 Total Lunar Eclipse Time and Phases. (NASA)

The second blood moon of the year and the last for us until 2025 is set to be the highlight in the sky early in the morning on Tuesday, November 8th.

A lunar eclipse occurs when the Sun, Earth and Moon all align in a way that the moon is in the Earth’s shadow. Tonight’s total eclipse will see the moon in the darkest part of the shadow and will turn the moon red, hence the name “blood moon.”

The eclipse starts at 1:55am MST and will be done at 6:06am MST. Totality begins at 3:17am and ends at 4:42am. Maximum eclipse will be at 3:59am.

You don’t need anything special to see the event as it will be easily visible with the naked eye. Binoculars though will provide a closer look.

The one hiccup we might have here in Thornton in being able to view the show is cloud cover. Overnight tonight moisture is expected to increase leading to partly to mostly cloudy skies. Hopefully, however, there will be some breaks in the coverage allowing a view. You can check the latest hour-by-hour sky cover forecast here.

This will be the last total lunar eclipse visible for us until March 14, 2025 so if you can get out of bed to see it and Mother Nature cooperates, it is well worth it.

For more about the eclipse see:

Time to “fall back” as Daylight Saving Time ends Sunday, November 6

The United States returns to Standard Time at 2:00am Sunday as Daylight Saving Time comes to an end.
The United States returns to Standard Time at 2:00am Sunday as Daylight Saving Time comes to an end.

The biannual ritual of changing our clocks to adjust for Daylight Saving Time occurs this weekend, providing yet another signal of the changing of seasons.  The United States will ‘fall back’ one hour at 2:00am Sunday morning as we return to Standard Time.

The ritual of changing our clocks twice a year can be met with some resistance as some people struggle to adjust their body’s internal clock.  Others actually like the return to standard time as they get to enjoy an extra hour of sleep.

The time change definitely has big effects on the dawning of daylight and how early it gets dark in the evening.

Sunrise on Saturday occurs at 7:33am but on Sunday it will be at 6:34am. Similarly, sunset will occur at 5:53pm on Saturday but on Sunday the sun will disappear over the horizon at 4:52pm.

For many this means that when they get home from work it will now be dark and outdoor activities will be significantly curtailed as a result.

Arizona and Hawaii are the only states that do not observe Daylight Saving Time and remain on Standard Time year round.    The U.S. territories of Puerto Rico, American Samoa, Guam, Northern Mariana Islands, and the United States Virgin Islands also do not observe the event.

It won’t be all that long though before Daylight Saving Time returns.  On March 12, 2023 we will ‘spring forward.’

Daylight Saving Time Schedule

The mandated beginning and end of Daylight Saving Time has changed in the United States over the years.

The most recent schedule was set by the Energy Policy Act of 2005 and took effect in 2007.  We now ‘spring forward’ to begin Daylight Saving Time on the second Sunday in March and ‘fall back’ with the return to Standard Time on the first Sunday in November.

Daylight Savings Time Dates

Year DST Begins 2 a.m.
(Second Sunday in March)
DST Ends 2 a.m.
(First Sunday in November)
2022 13 March 2022 6 November 2022
2023 12 March 2023 5 November 2023
2024 10 March 2024 3 November 2024
2025 9 March 2025 2 November 2025
2026 8 March 2026 1 November 2026
2027 14 March 2027 7 November 2027
2028 12 March 2028 5 November 2028
2029 11 March 2029 4 November 2029

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