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Thornton, Colorado, USA
UpdatedThu, 20-Jan-2022 8:05am MST 
 

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Chilly temperatures but calm conditions for Thornton’s Wednesday

Wednesday, November 17th, 2021 5:11am MST

Following the passage of yesterday’s cold front, we will remain on the chilly side of things today. However, winds will be calmer and we will have a good bit of sun above.

The pre-dawn hour may see a flurry or two of snow but nothing that will accumulate. Then, we will see cloud cover decrease through the day leading to sunny skies by the late afternoon / evening. High temperatures today will top out only around the 40-degree mark.

Tonight, the cold will be lingering and lead to our coldest temperature readings of the season so far. Look for lows in the mid to upper teens under mostly clear skies.

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Tuesday brings more mild temperatures but also a good dose of wind

Tuesday, November 16th, 2021 5:06am MST

Thornton will enjoy another day with well-above normal temperatures today. Unfortunately, wind will be a bigger part of the story and that will lead to elevated fire danger.

Partly clear skies start us off and will be with us for most of the daytime hours. Temperatures once again start out oddly mild early then will be warming to a high near 70 degrees. Winds will initially be calm but then begin ramping up by mid-morning. The afternoon will bring gusts in excess of 30 mph.

The wind coupled with the dry conditions and dry fuels have prompted the issuance of a Red Flag Warning. Be extremely careful out there.

Tonight, partly clear skies will be above with overnight lows in the mid to upper 20s. We do have just the slightest of chances to see rain / snow from about midnight to 3:00am. It does not seem likely and if precipitation does materialize, it isn’t expected to amount to much.

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Very warm temperatures, breezy winds for Thornton’s Monday

Monday, November 15th, 2021 4:53am MST

Not too bad of a way to start a workweek. We will enjoy temperatures about 20 degrees above normal today although there will be some wind as well.

Mostly sunny skies start us off. Cloud cover will steadily increase this morning leading to partly sunny to mostly cloudy skies in the afternoon. Warming, downslope winds will become breezy by late morning and last into early evening. Those winds will help propel us to a high in the mid-70s.

Tonight, skies remain mostly cloudy with overnight lows in the mid to upper 40s.

Keep an eye on the temps and wind here.

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November 14 to November 20: This week in Denver weather history

Sunday, November 14th, 2021 4:54am MST

This Week in Denver Weather History

Henry Fenton is probably not a name many folks are familiar with however he will forever be engrained in the Denver weather history books.  It was 150 years ago this week that Fenton made the first official Denver weather observations.

From the National Weather Service:

10 – 14:

In 2014…an Arctic cold front on the 10th…associated with a strong storm system over the northern Rockies blasted into northeast 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 through the morning of the 14th…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. The sudden drop in temperatures on the 10th…followed by several days of sub-freezing temperatures chilled trees to the core. The record drop in temperatures…preceded by mild fall temperatures…damaged or killed scores of trees across the Urban Corridor and Northeast Plains. At the time…the trees were not finished with the hardening process that enables them to withstand winter weather. Many were instantly flash-frozen…and some would not show signs of damage until spring of 2015. Of the 2.2 million trees in the city of Denver alone…tens of thousands were killed from the November frost. Denver estimated a citywide loss of more than 10 million dollars.

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.

12-15

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.

13-14

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.

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.

» Click here to read the rest of November 14 to November 20: This week in Denver weather history

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Thornton’s weekend to feature relatively warm temps, some clouds and breezy winds

Friday, November 12th, 2021 4:45am MST

All-in-all, the three day forecast doesn’t look too bad. It starts on the cool side but then warms up Saturday and Sunday although there will be some breezy winds.

For Friday, sunny skies will be above with highs topping out in the mid-50s. Overall, it will be calm, dry and cool. Tonight, lows dip to the mid-30s with mostly clear skies overhead.

Saturday we see an increase in moisture aloft and that will lead to a good bit of cloud cover – but no precipitation. Highs will be in the mid to upper 60s with some breezy winds. Saturday night, partly cloudy skies will be above as lows dip to around freezing.

Sunday will see slightly cooler temperatures with highs in the mid-60s under mostly sunny skies. Once again, some breezy winds will be seen.

Have a great weekend!

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Thornton’s Veterans Day to offer cool temps, more breezy winds

Thursday, November 11th, 2021 4:28am MST

Relatively typical weather for a November day on tap for us. Temps will be right near average and while we will enjoy sun, we will also have some breezy winds.

Sunny skies start us off and then a few clouds arrive giving us mostly sunny skies for most of the day. Temperatures will top out in the mid-50s. Breezy winds will again develop today, peaking between late morning and late afternoon. Gusts to 30mph will be possible.

This evening, clouds will increase as will moisture. This will lead to just a bit of a chance for a rain shower, perhaps even a bit of snow after 9:00pm. If we do see precipitation, it is not expected to amount to much unfortunately. Overnight lows will dip to just below freezing.

Have a great day today and be sure to take time to acknowledge those who have served in our nation’s uniforms. Remember their service and sacrifice and be thankful for them.

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Wednesday brings temps near normal, lots of sun but also breezy winds

Wednesday, November 10th, 2021 5:06am MST

On the plus side, today will see temps right near normal with lots of Colorado blue above. Unfortunately, however, on the other side is a good dose of wind that will be along.

Mostly sunny skies start us off then mostly sunny to sunny conditions for the balance of the day. High temperatures will be topping out right near the average high for the date of 55 degrees.

By about 8:00am or so wind speeds will be increasing. From late morning to mid-afternoon, gusts of 30+ mph will be possible. Late afternoon will see things start to settle down.

Tonight, winds will be calm by around 9:00pm. Overnight, skies will be mostly clear with lows around freezing.

Keep an eye on those wind speeds here.

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Cool temperatures, increasing clouds for Thornton’s Tuesday

Tuesday, November 9th, 2021 4:59am MST

Our weather forecast for today looks to be virtually identical to yesterday’s. Temps will be at, perhaps a bit above, normal with cloud cover increasing.

Mostly clear skies start us off early but clouds will steadily be increasing this morning leading to partly clear skies for the afternoon. Winds will be shifting from the south to the northwest through the day with some breezy winds possible in the mid-afternoon. High temperatures will top out in the mid to upper 50s.

Tonight, overnight lows will drop to 40 degrees with cloud cover decreasing after midnight.

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Monday cold front cools things down in Thornton

Monday, November 8th, 2021 5:00am MST

Following a gorgeous, mild weekend, things turn cooler and more in line with what we expect to see this time of year. A cold front pushed through this morning serving to cloud things up, cool it down.

Mostly sunny skies start us off but cloud cover will be increasing this morning and early afternoon. After that build up of clouds, it will soon start to ease though. We will remain dry today and other than for some slightly breezy PM winds, it will be calm. Highs will top out in the low to mid-50s.

Tonight, skies will continue to clear. Overnight lows will be around 30 degrees.

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November 7 to November 13: This week in Denver weather history

Sunday, November 7th, 2021 4:57am MST

This Week in Denver Weather History

Wind is always a factor on the plains and the fall usually brings a great deal of it, especially in November.  Our look back at this week in Denver weather history shows that event and snow are quite common this time of year.

From the National Weather Service:

From the 5th to the 7th:

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.

On the 7th:

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.

From the 7th to the 8th:

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

On the 8th:

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.

From the 8th to the 9th:

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.

» Click here to read the rest of November 7 to November 13: This week in Denver weather history

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