Thornton, Colorado, USA
UpdatedSat, 25-Mar-2023 7:40am MDT 


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Very mild temperatures, breezy winds for Thornton’s Tuesday

Tuesday, December 27th, 2022 4:59am MDT

From the chill of last week to mild mercury readings today. However, as if often the case this time of year, those mild readings will be as the result of breezy downslope winds.

Mostly sunny skies start us off and then the afternoon will see cloud cover increase a bit. Winds will be slightly breezy this morning then start ramping up by mid-morning. Look for it to be quite blustery then before easing around sunset. High temperatures will top out in the low to mid-60s.

Tonight, conditions will be calm with partly clear skies. Overnight lows will drop to around freezing.

Keep an eye on those temps and wind speeds here.

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Monday offers above normal temps, some cloud cover

Monday, December 26th, 2022 5:06am MDT

A calm day in Thornton with temps above normal. There will, however, be a good bit of cloud cover.

The day starts with partly clear skies and, for the most part, that is what we will see throughout the day. Winds will be out of the south and much calmer than yesterday. Look for highs to top out near the 50 degree mark.

Tonight, partly cloudy skies will be above with lows around freezing.

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Thornton’s December 2022 wintry blast sets records

Saturday, December 24th, 2022 5:51am MDT

Record Cold Temperatures

That’s a wrap! The Arctic blast is slowly on its way out and in its wake, we can see that we set a number of records.

ThorntonWeather.com has been in operation for 16 years and this cold was one for the books.

  • The 67.3 degree 24 hour temperature drop from Wed PM (52.7 degrees) to Thu AM (-14.6 degrees) was the biggest of the past 16 years
  • The -14.6 degrees low temp on 12/22/22 ties lowest temp recorded in the past 16 years (2/2/2011)
  • The 0 degree high temp 12/22/22 is the record low maximum temperature recorded in the past 16 years (old record was 1.9 degrees on 2/5/14)
  • A 31.1 degrees wind chill on 12/22 at 8:35am is the coldest wind chill temperature recorded in the past 16 years

For Denver, officially, some marks were set / tied as well.

  • The high temperature of -6 degrees on 12/22/22 ties for the 10th coldest high temperature on record. It also is a new record low maximum for the date, breaking the old record of -5 degrees set in 1983.
  • The low temperature of -24 degrees on the morning of 12/22/22 ties for the 8th coldest reading ever recorded in Denver.
  • The average temperature for 12/22/22 of -14 degrees ties for the 5th coldest daily average temperature recorded in Denver.
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Iowa sports reporter goes viral over coverage of winter storm

Friday, December 23rd, 2022 6:04am MDT

Sports reporter Mark Woodley of KWWL-TV in Iowa offered probably the most honest coverage of the winter storm that has gripped much of the nation. Normally he enjoys the warmth of the studio but the station sent him out onto the street to supplement their coverage. His reaction throughout the morning news is absolutely comical.

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Thornton’s weekend weather starts off cold, ends mild

Friday, December 23rd, 2022 5:18am MDT

A very cold day starts off the three-day period but by the end, we expect above normal temperatures to arrive.

For Friday, the cold from the storm will continue to have an impact. Following a very cold start, high temperatures today will only push toward the teens. Conditions will be calm, dry and sunny. Tonight, we will see a low of around zero early then it will actually warm a bit in the pre-dawn hours tomorrow.

Saturday sees us stage a return to near normal temperatures. Mostly sunny skies will be above with highs in the low 40s. Calm conditions can be expected. Saturday night, it will be mostly clear with lows in the low 20s.

For Christmas Day, you will have no problems traveling to gather with your loved ones for the holiday. Mostly sunny skies will be above with temps pushing to around 50 degrees. There will be some breezy winds but they won’t be overly strong.

Have a fantastic weekend and a blessed holiday!

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Thornton’s pre-Christmas storm moves out, bitter cold to linger

Thursday, December 22nd, 2022 5:12am MDT

Our storm system performed pretty much as expected. Thornton received 3.8 inches of snow overnight (as of 4:00am) and the mercury has dropped like a rock.

Roads are snowpacked and icy in spots with blowing snow off the road and cars creating limited visibility in some areas. If you venture out, be careful.

The storm is already on its way out but its effects will still be felt. We start out mostly cloudy but coverage will be easing and we will see a good bit of sun above. Temperatures are going to be extremely cold today with highs only topping out around zero degrees. Winds will be light but enough to generate dangerous wind chills.

Tonight, skies will be mostly clear and lows will approach the negative teens again.

The Winter Weather Advisory will expire at 9:00am but the Wind Chill Warning continues until 11:00am tomorrow.

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

Wednesday, December 21st, 2022 6:28am MDT

This Week in Denver Weather History

Looking back at Denver weather history, it is readily apparent that the week leading up to Christmas has historically been a very eventful one. There are certainly many of the snow and wind events we would expect to see. Most notable however are the major winter storms like the pre-Christmas storm of 2006 and of course what is arguably Denver’s most famous winter storm, the Christmas Eve Blizzard of 1982.

From the National Weather Service:


In 1924…a prolonged cold spell occurred after mild temperatures during the first half of the month. Most low temperatures dipped below zero with the coldest reading of 15 degrees below zero occurring on the 24th. The high temperature of only 5 degrees on the 18th was a record low maximum for the date.


In 1901…north winds were sustained to 52 mph with gusts to 58 mph behind an apparent cold front.

In 1973…a brief blizzard dumped heavy snow across metro Denver. Snowfall totaled 9.2 inches at Stapleton International Airport where north winds gusting to 53 mph produced much blowing snow. The storm forced many schools and businesses to close.

In 1996…a homeless man in Denver was found unconscious in his car suffering from exposure. The man’s body temperature was only 85 degrees when he was discovered. He died several hours later. Early morning temperatures had dipped to 9 degrees below zero.

In 1999…high winds were reported for a brief time in the foothills. Winds gusted to 72 mph in Golden Gate Canyon and to 71 mph at the National Center for Atmospheric Research in the foothills southwest of Boulder. West winds gusted to only 39 mph at Denver International Airport where the temperature warmed to a high of 53 degrees.

In 2002…only a trace of snow fell at the site of the former Stapleton International Airport. This…along with the trace of snow on the 5th…was the only snow of the month…ranking the month the 2nd least snowiest on record.

18-19 In 2012…a storm system brought moderate to heavy snow to the mountains and foothills west of metropolitan Denver and blizzard conditions to plains east of Denver metro area. The combination of snow and wind reportedly reduced visibility to just a few hundred feet at times…and resulted in several road closures including Interstate 70 east of Aurora. East of Denver gusty northerly winds ranged from 35 to 55 mph produced extensive blowing and drifting snow…ranging from 1 to 4 feet in depth. Storm totals ranged from 3 to 5 inches. In the mountain and foothills…the heaviest snowfall occurred along and north of I-70 and included: 12 inches at Genesee…9 inches near Eldorado Springs; 8.5 inches at Coal Creek Canyon…8 inches near Evergreen… with 6 inches at Eldora Ski Area…Idaho Springs… Gross Reservoir and Nederland. At Denver International Airport…1.7 inches of snowfall was observed. In addition…a peak wind gust to 35 mph was observed from the north on the 19th.


In 2010…a winter storm produced a 4-day period of moderate to heavy snow in the mountains. The combination of strong wind and heavy snow forced the closure of several mountain passes due to the threat of avalanches. The Amtrak train route… Which runs from Denver to California…was rerouted through Wyoming when Union Pacific closed its tracks along Interstate 70. Numerous accidents forced the closure of I-70 at times. The wind gusted to 60 mph over the higher mountain passes. Storm totals in the ski areas west of Denver ranged from 16 to 32 inches.


In 1998…a vigorous cold front with north winds gusting as high as 38 mph at Denver International Airport on the 18th dropped temperatures from a high of 51 degrees to a low of just 6 degrees before midnight. The arctic air mass that settled over metro Denver produced intermittent light snow and a week-long protracted cold spell that caused low temperatures to plunge well below zero for 6 consecutive nights. The coldest temperature was 19 degrees below zero on the morning of the 22nd. High temperatures climbed only into the single digits on 4 consecutive days…from the 19th through the 22nd. At least 15 people…mostly homeless… Were treated for hypothermia at area hospitals. The bitter cold weather was responsible…either directly or indirectly… For at least 5 fatalities. Three of the victims died directly from exposure. The cold weather also caused intermittent power outages. Following the cold snap… Thawing water pipes cracked and burst in several homes and businesses…causing extensive damage. Only one temperature record was set. The high temperature of only 7 degrees on the 19th set a record low maximum for the date.


In 1913…post-frontal heavy snowfall totaled 8.5 inches over downtown Denver. North winds were sustained to only 16 mph.

In 1994…an intense pacific storm system and associated cold front moved across Colorado early in the day. Strong downslope winds buffeted the Front Range eastern foothills. The highest wind gust recorded was 92 mph at Rocky Flats in northern Jefferson County. Most of the wind gusts during the day ranged from 63 to 86 mph with lighter gusts of 40 to 58 mph on the northeast plains. The strong winds downed power lines and poles in south Lakewood…causing power outages to 2400 homes. Other small power outages and surges occurred across metro Denver. Northwest winds gusted to 43 mph at Stapleton International Airport.


In 1982…high winds buffeted the eastern foothills. At midday on the 19th…gusts of 75 to 80 mph were recorded in the Table Mesa area of Boulder. A gust to 62 mph was clocked in Boulder on the evening of the 20th.

In 1989…strong winds howled at mountain top level in clear creek and Gilpin counties. Speeds reached 97 mph on the summit of Squaw Mountain and 84 mph one mile south of Rollinsville. Northwest winds gusted 35 mph at Stapleton International Airport on the 20th.


In 1990…a surge of very cold arctic air invaded metro Denver. Many temperature records were broken as the mercury remained at or below zero for 85.5 hours at Stapleton International Airport…making it the third longest period of subzero readings in 118 years of record keeping. On the morning of the 22nd…the mercury plunged to 25 degrees below zero…which equaled the all time record low temperature for the month set on December 24…1876. In the foothills southwest of Denver at tiny town…the mercury plunged to 33 degrees below zero on the morning of the 21st. On the same morning at Castle Rock the temperature dipped to 26 degrees below zero. During the period…other daily temperature records were set at Denver…including: record low maximum of 3 degrees below zero on the 20th and a record low of 17 degrees below zero on the 23rd. The record low was equaled with 16 degrees below zero on the 20th and 21 degrees below zero on the 21st. Snowfall totaled 2.7 inches at Stapleton International Airport from the 19th through the 21st.


In 1894…southwest winds were sustained to 40 mph with gusts to 48 mph. The Chinook winds warmed the temperature to a maximum of 69 degrees…which was a record high temperature for the date. The minimum temperature dipped to only 33 degrees.

In 1903…northwest Chinook winds sustained to 54 mph with gusts to 60 mph warmed the temperature to a high of 58 degrees.

In 1948…strong winds occurred along the eastern foothills from Boulder north. Wind gusts to 45 mph were recorded at Valmont with a gust to 30 mph at Boulder airport. Some damage occurred. Wind gusts to 50 mph caused some blowing dust at Stapleton Airport.

In 1957…strong Chinook winds…gusting to 51 mph from the northwest…warmed the afternoon temperature to a high of 54 degrees.

In 1981 high winds were reported in the foothills with a peak gust of 87 mph recorded at Wondervu.

In 1992…strong Chinook winds raked the eastern foothills with 69 mph recorded at Table Mesa in south Boulder. Southwest winds gusted to only 21 mph at Stapleton International Airport.

In 1996…five construction workers were injured…two seriously…when a sudden wind gust blew over a 30-foot- high retaining wall they were working on in western Lakewood. The scaffolding they were standing on collapsed…and some were pinned under the rubble for 15 minutes. Wind gusts of 60 to 75 mph were reported in the area. Southwest winds gusted to only 24 mph at Denver International Airport.

In 2004…strong downslope winds developed over the eastern mountain slopes and spread over metro Denver. Peak wind gusts approached 100 mph along the foothills of Boulder County. In Superior…a 1200-square-foot section of roof was peeled off the gymnasium at Monarch High School. Two semi-trailers were toppled on Colorado highway 58 at McIntyre Street and another at c-470 and west Bowles Avenue. Two airplanes were damaged by wind-blown debris at Jefferson County Airport. The high winds forced the closure of State Highway 93 between Golden and Boulder for approximately two hours. Insurance agents estimated 650 to 850 homes suffered wind damage in the Boulder and Louisville areas. In addition…downed trees and power lines left about 1000 residents…mainly in the Boulder area…without electricity. At least three people suffered minor injuries in the storm. Peak wind reports included: 95 mph in Superior…92 mph at Jefferson County Airport…85 mph in Golden…81 mph in Boulder…80 mph in Broomfield and Evergreen…and 79 mph in Louisville. West northwest winds gusted to 59 mph at Denver International Airport.


In 1969…high winds caused widespread…but mostly minor damage to roofs…windows…and power lines and overturned some house trailers in areas along and just east of the foothills. Wind gusts of 60 to 70 mph were reported in Boulder and south of Boulder at Rocky Flats. A wind gust to 115 mph was measured in Boulder at the National Center for Atmospheric Research. At Stapleton International Airport…west winds gusted to 44 mph on the 20th and to 45 mph on the 21st. The warm Chinook winds warmed the high temperature to 56 degrees on the 20th and to 65 degrees on the 21st.

In 2006…a major blizzard buried greater metro Denver and the adjacent foothills in deep snow. A slow moving upper level low pressure center produced deep moist upslope flow over the high plains and against the eastern slopes of the mountains…allowing heavy snowfall to persist for 34 hours across metro Denver. Total snow accumulations ranged from 1 to 2 1/2 feet across the city and from 2 to nearly 4 feet in the foothills. Adding to the misery… Strong north winds sustained at 20 to 35 mph with gusts from 45 to nearly 60 mph produced much blowing snow and piled the snow into drifts from 6 to 12 feet high…closing businesses and bringing all transportation to a halt. The storm forced the closure of Denver International Airport for a total of 45 hours which snarled the nation’s air traffic system. This was the longest closure in the airport’s 12 year history. The closure stranded nearly 5000 travelers when 2000 flights were canceled. Many inbound flights were diverted to other airports…stranding even more passengers. Many of the stranded travelers failed to reach their final destinations until days after the airport re-opened due to fully booked flights during the holiday season. Police and national guardsmen rescued hundreds of commuters stuck in their cars…and sent them to temporary shelters set up by the Red Cross. All interstates and other major highways in and out of Denver were closed. Greyhound was forced to cancel all bus trips from Denver. Mail delivery was suspended. The Regional Transportation District suspended all metro Denver bus service for the first time since the March 2003 blizzard. The roof of a discount store in Aurora collapsed under the weight of the heavy snow. In Lakewood…a power outage left 5600 residents without electricity for a brief time. Metro Denver snowfall amounts included: 34 inches 10 miles southeast of Buckley AFB…32 inches in Littleton…30 inches in Thornton and near Castle Rock…29.5 inches near Parker…28 inches in Wheat Ridge…25.5 inches at centennial airport…25 inches at Niwot…24 inches in Aurora…22.5 inches at Greenwood Village… 22 inches in Arvada…21.5 inches in Lakewood…20 inches in Longmont…and 15.5 inches in Boulder. Snowfall measured 20.7 inches officially in the Denver Stapleton area. This ranked the snowfall as the 7th greatest in the city since 1946. North winds were sustained to 37 mph with gusts to 55 mph at Denver International Airport. In the foothills snowfall totaled: 42 inches at Conifer and 11 miles southwest of Boulder…40 inches at Evergreen…39 inches at Aspen Springs… 37.5 inches 8 miles north of Blackhawk…33 inches near Nederland…31 inches at Intercanyon and near Tiny Town…30.5 inches atop Buckhorn Mountain…30 inches near Indian Hills… 29 inches at Rollinsville…24 inches near Gross Reservoir and Ralston Reservoir…22.4 inches atop Crow Hill…and 20 inches near Georgetown. Snowpacked and rutted streets and parking lots persisted for a month or more after the storm and subsequent storms. The heavy snowfall created a snow removal controversy when many citizens complained that residential streets were not cleared in a timely manner in the city and in some suburban areas. This was in spite of the fact that tens of millions of dollars were spent on snow removal. In the city of Denver…snow cover of an inch or more from this storm and subsequent storms persisted for 61 consecutive days…through February 19…2007. This is the second longest period of snow cover on record in the city. Many homeowners who had extensive Christmas lights and decorations in their yards were not able to remove the lights because the wires were buried in deep snow and ice until the end of February or later.

In 2020…very strong downslope winds developed along the Front Range. Peak wind gusts reached 95 mph near Caribou… with a gust of 93 mph near Berthoud Pass. Peak gusts elsewhere included: 87 mph near Tolland…83 mph near White Ranch Open Space…82 mph near Rocky Flats…81 mph near Nederland…80 mph near Georgetown…78 mph near Ward…and 77 mph near Crisman.

» Click here to read the rest of December 18 to December 24: This week in Denver weather history

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Thornton’s Wednesday starts off relatively nice but wintry blast arrives later

Wednesday, December 21st, 2022 5:19am MDT

Here is comes. The much-talked about blast of Arctic cold is set to arrive later today.

The day starts out nice enough with mostly sunny skies and highs topping out close to 50 degrees in the early afternoon. The initial signs of the storm system will come in the form of wind which will be picking up by mid-morning then will be quite blustery for the rest of the day through much of tonight.

A few flurries may be seen mid to late afternoon. Late afternoon / evening is when things get interesting.

Temperatures will begin to plummet by about 4:00pm as the front hits. By about 11:00pm tonight the mercury will be down to zero on its way to an overnight low around -10 degrees.

Best chances for snow come from about 5:00pm to 10:00pm then will taper off through the early morning hours tomorrow. Total snow accumulations look to be in the 1 to 3 inch range with much depending on timing and temperatures. There is the potential for a stronger band of snow that could up those numbers, however, systems with this type of extreme cold are more likely to underperform forecasts.

The nasty cold temperatures coupled with blustery winds have warranted a Wind Chill Warning to be issued. Wind chill temperatures will reach dangerous levels tonight and through tomorrow and tomorrow night. A Winter Weather Advisory has also been issued for tonight due to the snow which will have the potential to create hazardous driving conditions. Needless to say, you need to be extraordinarily careful should you venture out.

For all the latest, check out our Winter Weather Briefing Page.

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Calm, chilly conditions with a good bit of cloud cover Tuesday

Tuesday, December 20th, 2022 5:01am MDT

I reckon you could call this the calm before the storm. Thornton will have a day today of relatively benign weather with temps near normal but with clouds.

Partly cloudy skies start us off then the cloud cover will build leading to mostly cloudy skies for most of the day. Overall, conditions will be calm with winds being light. Look for highs to top out near the average high for the date of 43 degrees.

Tonight, lows will drop to the upper teens under partly cloudy skies.

As for the Arctic blast we have been anticipating, it continues on track with no notable changes to what we have been forecasting. Arriving late tomorrow, we will see temperatures plummet overnight Wednesday and bone-chilling cold Thursday and Thursday night. A Wind Chill Watch will be in effect. More on our Winter Weather Briefing Page.

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Thornton’s workweek starts off with temps near normal, blustery winds

Monday, December 19th, 2022 5:06am MDT

The first couple of days of the workweek won’t be too bad. We will enjoy mercury readings near normal but with some wind. All eyes continue to watch the blast of cold later this week and a Wind Chill Watch has now been issued for it.

For today, mostly sunny skies will be above throughout. High temperatures will top out near the average high for the date of 43 degrees. We will see some breezy winds this afternoon.

Tonight, winds will ease by about 6:00pm. Overnight, skies will be partly clear with lows dipping into the teens.

The cold blast we are expecting late in the day Wednesday continues on track. Temperatures will plummet with overnight lows well below zero Wednesday night and Thursday night. Thursday, highs may not even make it to zero. There will be some snow, but not much, maybe 1 to 3 inches.

The extreme cold coupled with the wind has prompted a Wind Chill Watch to be issued for the period from 8:00pm Wednesday to 11:00am Friday. The expected wind chill temperatures will be dangerous and caution is certainly warranted. Read the complete watch here.

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