Thornton, Colorado, USA
UpdatedThu, 07-Jul-2022 1:25am MDT 


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Monday brings cooler temperatures, just a slight chance for overnight snow

Monday, December 27th, 2021 5:01am MDT

Following yesterday’s cold front passage, today chills out a bit with temps close to normal. A second front pushes through overnight bringing just a bit of a chance for snow.

The day starts off mostly sunny then we will see a few more clouds in the afternoon. Daytime conditions will be dry with some breezy afternoon winds. Highs will be topping out in the mid-40s, near the average high for the date of 43 degrees.

Tonight, cloud cover will increase and a cold front will move through after midnight. The early morning hours before dawn may see a little bit of snow fall but if it does, it will not amount to much at all. Overnight lows will drop to around 20 degrees.

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Thornton’s Christmas weekend to offer up continued mild temps, one chance for rain

Friday, December 24th, 2021 5:25am MDT

Well, clearly we are not going to be getting the proverbial white Christmas. While we may see some precipitation today, it will be in the form of rain and temperatures are going to remain mild through the three-day period.

For today, partly sunny skies will be above with clouds increasing. Some sprinkles may be seen this AM with the best chance for rain coming from noon to 6:00pm. What rain does fall will, unfortunately, not amount to much. There will also be some breezy winds. Highs will be around 50 degrees. Tonight, partly cloudy skies will be above with overnight lows in the mid to upper 20s.

Christmas Day will be a mild, relatively calm day. High temperatures will reach the mid-50s under mostly sunny skies. Again, some breezy winds will be seen. Saturday night into Sunday morning, lows will dip to the mid-20s under mostly clear skies.

Sunday cools down a bit with highs in the low 50s. Mostly sunny skies will be above and winds will be a bit stronger. Thornton Weather wishes you all a very merry Christmas!

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Another mild, dry day for Thornton but change is on the horizon

Thursday, December 23rd, 2021 5:05am MDT

Just rinse and repeat forecasts from recent days (and weeks) and you know what today’s weather holds. Mild temps, some breezy winds and dry conditions will continue to be the operative words. However, we are looking to move into a bit of an unsettled pattern that gives us at least some chances for precipitation.

For today, mostly to partly sunny skies start the day then partly sunny skies will be dominant for the balance of the day. We will be dry with some breezy winds in the afternoon. High temperatures will top out in the mid to low 60s.

Tonight, lows will drop to the mid-30s under partly clear skies. Some breezy winds will be seen in the overnight hours.

As for what lies ahead… A series of disturbances are set to make themselves felt over the next several days. The first of these arrives tomorrow bringing us a chance to see some light rain. Then, Sunday and Monday bring us a couple more chances for precipitation, those in the form of snow. Keep your fingers crossed that this signifies a shift in the dry pattern we have seen for the last couple of months! More in the extended forecast here.

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December 19 to December 25: This week in Denver weather history

Wednesday, December 22nd, 2021 5:07am MDT

This Week in Denver Weather History

Cold and snow dominate our look at the week leading up to the Christmas holiday.  Certainly the infamous Christmas Eve Blizzard of 1982 is the one event that most long-time resident will remember as it was truly one for the history books.  Also notable was a cold front that moved through in 1988 that dropped temperatures well below zero and was responsible for at least five deaths.


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 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 Amtrack 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 1933…strong downslope winds produced a warm spell. Low temperatures of 43 degrees on both the 20th and 21st and 41 degrees on the 22nd were record high minimums for those dates.  High temperature of 67 degrees on the 21st was a record maximum for the date.  High temperatures of 56 degrees on the 20th and 69 degrees on the 22nd were not records; however…the 69 degrees was the warmest of the month.  West to northwest winds were sustained to 20 and 24 mph on the 21st and 22nd respectively.


In 1918…light snowfall on each day totaled 12.0 inches over downtown Denver.  Northeast winds were sustained to 16 mph on the 21st.

» Click here to read the rest of December 19 to December 25: This week in Denver weather history

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Very mild temperatures, some breezy winds for Thornton’s Wednesday

Wednesday, December 22nd, 2021 5:01am MDT

Mid-week brings more of the same. Once again we will see dry conditions with temps well above normal and some breezy winds.

Mostly clear skies will be above to start things off then just a few more clouds for the balance of the daytime hours. Some breezy winds will be seen throughout much of the day. Those warm, downslope winds will help to elevate highs today to the low to mid-60s.

Tonight, winds will ease and partly cloudy skies will be above. Overnight lows will drop to around 30 degrees.

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Tuesday to offer mild temperatures, some breezy winds

Tuesday, December 21st, 2021 5:32am MDT

These forecasts have gone beyond being repetitive and are quite boring at this point. Once again Thornton will see mild temperatures, dry conditions and some breezy winds.

The day starts off with some cloud cover but that will ease quickly this morning leading to mostly sunny skies for the majority of the day. West winds will be picking up by mid-morning with breezy conditions expected into the evening. High temperatures will top out around 60 degrees.

Tonight, lows will dip to a bit below freezing under mostly clear skies.

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Mild temperatures, lots of sun start Thornton’s workweek

Monday, December 20th, 2021 5:06am MDT

We are set to continue the mild, dry conditions of recent weeks not only for today but through much of the week.

For today, mostly clear skies start us off then most cloud cover will be done by mid to late morning leading to sunny skies. Overall conditions will be calm but with some slightly breezy winds in the afternoon. High temperatures will top out near the 60 degree mark, almost 20 degrees above normal.

Tonight, we will see some clouds late and overnight temperatures will dip to below freezing.

For the rest of the week, more of the same will be in store through Thursday. Friday a system gives us a glancing blow and just the slightest chance for some precipitation. Next weekend should be dry and warmer than normal. Have a look at the extended forecast here.

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Cool temps, some breezy winds for Thornton’s weekend weather

Friday, December 17th, 2021 4:58am MDT

Largely typical weather for this time of year is in store for us this weekend. The three day period offers up a couple days with temps right near normal then a bit of a warm up.

For Friday, sunny skies will be above with highs in the low to mid-40s. There will be some breezy winds from late morning into the evening making it feel a bit chilly. Tonight, skies will be mostly clear and lows will be dropping into the low teens.

Saturday will offer calmer but cool conditions. Expect sunny skies with highs again in the low to mid-40s but with less wind. Saturday night, lows will be around 20 degrees under mostly clear skies.

Sunday will close things out with the warmest day of the three-day period. Highs will climb to the mid-50s under mostly sunny skies.

Have a great weekend!

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Thursday in Thornton to offer lots of sun, cool temps

Thursday, December 16th, 2021 4:53am MDT

Following yesterday’s dramatic wind, today will be far calmer. Temps will remain cool but there will be plenty of blue skies above with just some breezy winds later in the day.

Clear skies start us off then a few clouds arrive later in the morning but nothing too intrusive. Overall, conditions will be calm and dry. Some breezy winds will be seen in the mid to late afternoon. High temperatures today will top out near the 50-degree mark.

Tonight, lows will be dropping to the low to mid-20s under mostly clear skies.

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Very windy Wednesday ahead, cooler temps, chance for precipitation

Wednesday, December 15th, 2021 5:05am MDT

Today we see temps cool down to near normal and might see just a little bit of rain or snow. Most notable however will be the wind that will have the potential to be damaging.

Mostly cloudy skies start us off and we will have just a chance to see some drops or rain, perhaps a few snowflakes until about 10:00am. Unfortunately, any precipitation is not expected to amount to much. Cloud cover will begin to ease after 10:00am. Temps today will top out in the mid-40s, right near average.

Most notable will be strong winds that will begin to develop after sunrise and peak around noon. They will then slowly taper off in the afternoon. The potential is there for winds of 40+ mph with gusts exceeding 60 mph. Those speeds that may cause damage and result in power outages, downed trees and fences, overturned vehicles, etc. Extreme caution is advised.

Additionally, with the wind and low humidity, fire danger will be elevated. A High Wind Warning and Red Flag Warning are in effect from 8:00am to 5:00pm. You can read the full text of the warnings here.

Tonight, it will remain breezy until midnight. Mostly clear skies will then be seen with overnight lows around 20 degrees.

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