Thornton, Colorado, USA
UpdatedSun, 07-Mar-2021 1:10pm MST 


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Another mild, dry day for Thornton’s Tuesday

Tuesday, December 8th, 2020 5:18am MST

We will be fortunate enough enjoy another, beautiful late fall day today. Highs will once again be well above normal with lots of that beautiful Colorado blue above.

Sunny skies will again be the rule without a cloud in the sky. Winds will be light, conditions calm and dry. We will be aiming for a high temperature in the low 60s.

Tonight, skies remain clear with overnight lows in the upper 20s.

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Clear skies, mild temperatures start off Thornton’s workweek

Monday, December 7th, 2020 5:00am MST

A high pressure ridge has settled in and will be responsible for a very nice Monday. Temperatures will be well above normal and conditions calm.

Sunny skies will be the rule throughout the day today. Winds will be light and out of the southwest. Highs today will top out in the low 60s, well above the average high for the date of 43 degrees.

Tonight, skies will remain clear with overnight lows in the mid-20s.

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Thornton to enjoy a weekend of calm conditions, mild temperatures

Friday, December 4th, 2020 5:07am MST

With high pressure dominating and not looking to go anywhere soon, the forecast for this weekend is pretty simple. Above normal temps and lots of blue sky will be the rule throughout.

Friday kicks things off with sunny skies and highs pushing to the upper 50s. Overnight tonight, skies remain clear with lows dropping to the mid-20s.

Saturday does cool down a bit but mercury readings will remain above normal. Look for highs in the low to mid-50s with sunny skies and calm conditions. Overnight Saturday into Sunday, skies will be mostly clear and overnight lows again drop to the mid0-20s.

The weekend closes out on Sunday in fine fashion. Sunny skies will be above with highs in the mid to upper 50s.


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Thornton’s December weather preview: Winter arrives in earnest

Thursday, December 3rd, 2020 5:40am MST

Thornton, Colorado's December Weather Preview

Recent months have, overall, been warmer and drier than normal.  Last month continued that trend.  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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Thursday to offer up clear skies, cool temperatures, calm conditions for Thornton

Thursday, December 3rd, 2020 5:05am MST

A nice looking late fall day ahead for us. We will have virtually cloudless skies and temperatures will be topping out right near average.

Sunny skies start us off and will be with us throughout the day. Winds will be light, overall conditions calm and dry. Highs today will top out a few degrees above the average high for the date of 45 degrees.

Tonight, skies remain clear with overnight lows in the low 20s.

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Chilly temperatures, breezy winds for Thornton’s Wednesday

Wednesday, December 2nd, 2020 5:00am MST

A relatively uneventful weather day for us but not an overly pleasant one. Temperatures are going to remain cold and breezy winds will make it seem colder.

Mostly sunny skies start us off then we expect to see an increase in coverage later this morning. This afternoon will bring partly sunny skies. Temperatures today will top out only in the low to mid-30s. Breezy, north winds will be a persistent feature, making it seem colder than what the thermometer says.

Tonight, winds will ease and partly clear skies will be above. Overnight lows will be dropping to the mid-teens.

On the plus side, we will be seeing warmer temperatures for the balance of the week and through the weekend.

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First day of December brings cold temperatures, blustery winds and some snow flurries

Tuesday, December 1st, 2020 5:05am MST

A turn toward wintry weather for Thornton today. The first of two systems will arrive this morning and while it will turn colder, moisture is lacking so we aren’t expecting much snow.

Mostly cloudy skies will be with us throughout the day today. The cold front will push through mid-morning and when it does, winds will be picking up. Blustery winds with gust to 30mph will then be with us into the evening.

High temperatures today will top out in the mid-30s before noon then begin a slow drop from there. As for snow, from noon into the evening, some flurries / light snow will be possible but at this time we are not expecting any accumulations.

Tonight, skies remain mostly cloudy with overnight lows dropping to the upper teens. Again, some light snow and flurries will be possible overnight but with no accumulation expected.

Winter Weather Briefing Page.

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Monday to offer temps a bit above normal, lots of sun

Monday, November 30th, 2020 5:00am MST

A pretty good looking late fall day ahead for Thornton. It will, in fact, be the nicest day of the week with cold and potentially some snow on tap in the days to come.

Today will see sunny skies above throughout with light winds out of the southwest. We start out quite cold with temperatures in the teens but then will warm up nicely to the low 50s.

Tonight, mostly clear skies will be above with overnight lows dropping to the mid-20s.

Looking ahead, a cold front will move in tomorrow and that will bring a chill to the air Tuesday and Wednesday. Snow will be possible over that period but at the current time are not expecting much at all. The later part of the week will see gradual improvement and we should see temps in the 50s for the coming weekend. Get more details in the extended weather forecast here.

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November 2020 top shots: Monthly photo slideshow

Sunday, November 29th, 2020 6:19pm MST
A beautiful sunrise starts the day on November 3, 2020. (Bill Hutchinson)

A beautiful sunrise starts the day on November 3, 2020. (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 29, 2020
  • 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.

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!

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November 29 to December 5: This week in Denver weather history

Sunday, November 29th, 2020 5:01am MST

This Week in Denver Weather History

As always, our look back at Denver’s weather history books is very eventful.  As we start to get closer to winter, we begin to see many more multi-day snow events that are notable and this week’s look is no different.  We see many major snow events and also of note are the damaging high wind events.

From the National Weather Service:


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.
28-29 in 1908…heavy snowfall overnight and for most of the day on the 29th totaled 12.5 inches.  Precipitation was 1.09 inches.  Northwest winds were sustained to 26 mph on the 29th.

In 1928…a major storm dumped 15.5 inches of snowfall on downtown Denver.  North winds were sustained to 18 mph with gusts to 19 mph on the 28th.

In 1992…an upper level storm system moved across metro Denver…but left only a dusting of snow.  Snowfall totaled only 1.6 inches at Stapleton International Airport where north winds gusted to 25 mph.  Other snow amounts included: 8 inches at Conifer…6 inches at Lake Eldora…3 inches at Rollinsville and in southeast Denver.

In 1997…a storm system tracking across northern New Mexico produced strong north to northeast upslope flow against the eastern slopes of the Front Range and Palmer Ridge. Snowfall totals in Jefferson County included:  14 inches near Deckers; 12 inches at Castle Rock and Sedalia; 10 inches near Conifer…11 miles southwest of Morrison…and at Buffalo Creek.  Elsewhere…snow accumulations were less. Snowfall totaled only 0.7 inch at the site of the former Stapleton International Airport on the 27th and 28th.

In 2004…heavy snow fell in the foothills and across metro Denver.  In the foothills…snowfall totals included:  13 inches at Roxborough State Park and Eldorado Springs… 11.5 inches near Conifer…11.0 inches near Nederland…and 10 inches near Indian Hills.  Across metro Denver snowfall totaled 14 inches near Sedalia…9 inches near Louisville… 8 inches at Ralston Reservoir…and 5.1 inches in the Stapleton area of Denver.  Northeast winds gusted to 28 mph at Denver International Airport on the 28th.

In 2006…a slow moving storm system brought heavy snow to the mountains and to the eastern foothills where snowfall ranged from 8 to 18 inches.  Some of the more impressive snow totals included:  18 inches at Genesee…17.5 inches near Boulder…17 inches at aspen springs…16.5 inches 10 miles northwest of Golden…15 inches at Eldorado Springs… 14.5 inches in Idaho Springs and near Jamestown…12 inches in grant and near Indian Hills…11.5 inches near Blackhawk… 11 inches at gross reservoir and Eldora…and 10.5 inches in Conifer.  Across metro Denver…storm total snowfall generally ranged from 5 to 9 inches with the heaviest amounts near the foothills in Boulder and Jefferson counties.  The most impressive totals included:  15.5 inches at Ken Caryl…12 inches in Boulder…7.5 inches near Morrison…and 7 inches near both Chatfield and Ralston reservoirs.  Snowfall totaled only 4.2 inches in the Denver Stapleton area.  Northeast winds gusted to 31 mph at Denver International Airport on the 28th.


In 1991…a winter storm dumped heavy snow in the foothills and near the Palmer Divide with 10 inches recorded at Conifer and Golden Gate Canyon…12 inches in Morrison… 6 inches at Castle Rock and Parker.  Only 3.4 inches of snow fell at Stapleton International Airport where north winds gusting to 35 mph on the 29th…produced some blowing snow.  Some light freezing drizzle also fell on the 28th and 29th.


In 1877…the all-time lowest recorded minimum temperature in the month of November…18 degrees below zero…occurred. The high temperature for the day was 16 degrees.

In 1899…northwest winds were sustained to 51 mph with gusts as high as 60 mph.  The Chinook winds warmed the temperature to a maximum of 74 degrees…a record high for the date and the warmest of the month that year.  The minimum temperature was only 39 degrees.

In 1927…post-frontal rain changed to snow and totaled 5.8 inches over downtown Denver.  Northeast winds were sustained to 22 mph.

In 1977…85 mph winds were reported at Wondervu in the foothills southwest of Boulder.  Northwest winds gusted to 39 mph at Stapleton International Airport.

In 1980 strong Chinook winds reached 85 mph in Boulder… Blowing traffic signals and street lights down.  Some windows were shattered by the wind.  West winds gusted to 37 mph at Stapleton International Airport.

In 1994…high winds blew across the Front Range eastern foothills.  Wind gusts to 92 mph occurred atop squaw mountain…5 miles south of Idaho Springs…and to 82 mph on fritz peak near Rollinsville in the foothills southwest of Boulder.  A wind gust to 75 mph was recorded at Jefferson County airport near Broomfield.  Northwest winds gusted to only 35 mph at Stapleton International Airport. No damage was reported.


In 2008…a storm system produced locally heavy bands of snow across Douglas…Elbert and eastern Jefferson counties. Northerly winds gusting to 50 mph caused snow drifts to pile up to 2 feet in depth.  Storm totals included:  12 inches just southwest of Kassler…11.5 inches…6.5 miles southwest of Castle Rock; 11 inches…8.4 miles southeast of Aurora and 9 miles west of Littleton; 10 inches at Louviers… 8 inches…2 miles west-southwest of Highlands Ranch and 5 miles south-southeast of Sedalia…and 7.5 inches…14 miles west-southwest of Agate and at Castle Pines.  At Denver International Airport…2 inches of snow was observed. North winds gusted to 46 mph on the 30th.


In 1899…west winds were sustained to 45 mph with gusts as high as 48 mph.

In 1903…west winds sustained to 44 mph with gusts to 54 mph warmed the temperature to a high of 57 degrees.

In 1981…strong winds blasted the foothills.  In Wondervu… Winds were clocked to 81 mph with many other locations in the foothills reporting over 60 mph.  Northwest winds gusted to 28 mph at Stapleton International Airport.

In 1986…the worst snow storm of the season dumped from 5.0 inches of snow at Stapleton International Airport to 14 inches over the higher southwestern suburbs.  On the Sunday after thanksgiving…one of the busiest travel days of the year at Stapleton International Airport…two of the four runways were closed and flights were delayed up to four hours.  Near-blizzard conditions prevailed on the plains east of Denver…closing both I-70 and I-76 for a time. North wind gusts to 36 mph were recorded at Stapleton International Airport.

In 2000…strong winds raked metro Denver.  In Thornton…a construction worker was critically injured when the scaffolding on which he was standing collapsed…throwing him 25 feet to the ground.  West winds gusted to 54 mph at Denver International Airport.


In 1929…heavy snow blanketed the city.  Snowfall totaled 9.8 inches downtown.  North winds were sustained to 32 mph with gusts to 37 mph on the 30th.

In 1970…high winds blasted Boulder and the eastern plains. In Boulder…a wind gust to 112 mph was recorded at the National Center for Atmospheric Research with a gust to 96 mph at the national bureau of standards.  In downtown Boulder…wind gusts reached 76 mph.  At Stapleton International Airport…winds gusted to 47 mph.  The high winds caused widespread light to moderate property damage across most of metro Denver.  Roofs…signs…trees…power lines…and other property were damaged.  Blowing dust reduced visibility to near zero over most of eastern Colorado.  Several mobile homes…campers…and semi- trailers were blown off the highways north of Denver.

In 1985…an intrusion of cold arctic air into metro Denver resulted in setting 3 temperature records.  The temperature climbed to only 17 degrees on the 30th…setting a record low maximum for the date.  On the 1st…the temperature plunged to 6 degrees below zero…setting a record low for the date… And warmed to only 7 degrees…setting a record low maximum for the date.


In 1975…very strong Chinook winds up to 100 mph caused damage to homes…aircraft…aircraft hangars…mobile homes… Cars…and power lines along the eastern foothills.  Strong northwest winds gusted to 39 mph at Stapleton International Airport on both the 30th and the 1st.

» Click here to read the rest of November 29 to December 5: This week in Denver weather history

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