Thornton, Colorado, USA
UpdatedSat, 27-May-2023 8:20pm MDT 


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Chilly temperatures, breezy winds for Thornton’s Monday

Monday, February 6th, 2023 5:02am MDT

A bit of a change in the weather from what we saw this past weekend. A passing system will chill us out a bit and bring some breezy winds.

Partly sunny skies will be above throughout the day with a bit of an increase in coverage late in the day. Winds will be light initially but soon pick up the pace and become breezy. High temperatures will be topping out in the low 40s.

Tonight, skies will clear after midnight and lows will dip to around 20 degrees.

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February 5 to February 11: This week in Denver weather history

Sunday, February 5th, 2023 5:24am MDT

This Week in Denver Weather History

February is generally a relatively calm weather month however just like any other month in Denver, it can and does see its extremes. In looking back at the Denver weather history calendar for the week, there are many entries for damaging wind, some heavy snowfall and extreme cold.

From the National Weather Service:


In 1985…a cold front on the 29th produced a protracted cold spell as arctic air remained entrenched across metro Denver. While the only daily temperature record set was a low maximum reading of 2 degrees on February 3rd…minimum temperatures plunged well below zero on 9 consecutive days. The coldest readings were 15 degrees below zero on January 31st and 14 degrees below zero on February 5th.


In 1963…warm weather that began with the strong Chinook winds on the 31st and 1st continued through the 8th. Maximum temperatures through the period ranged from 52 degrees on the 2nd to 76 degrees on the 5th…which was a new record high for that date.


In 1899…a protracted cold spell lasted almost two weeks. Low temperatures plunged below zero on all days but February 9th with a reading of 6 degrees. The coldest low temperature of 22 degrees below zero on February 6th was a record low for the date. Low temperatures of 20 degrees below zero occurred on both February 11th and 12th… But only the 11th remains as the record minimum for the date. High temperature of only 5 degrees below zero on February 11th was a record low maximum for the date. High temperatures climbed to only zero degrees on both February 2nd and 3rd…but were not records. Intermittent light snow or flurries fell during the period. The most snowfall…2.0 inches…occurred on February 2nd.


In 1985…the most bitter cold spell of the winter season brought sub-zero temperatures to metro Denver. Daily low temperature records were broken at Denver. The usual cold weather problems struck including stalled vehicles…jammed traffic lights…and frozen water and sewer lines. At Stapleton International Airport…the high temperature was only 2 degrees above zero on the 1st…setting a record low maximum for the date. Low temperatures reached 13 below zero on the 1st…12 below on the third…and 14 below on the 5th.


In 1989…one of the century’s worst doses of winter weather ravaged the entire state. Bitterly frigid weather moved into metro Denver on the 1st as snow buried many sections of the state. In metro Denver where 3 to 6 inches of snow fell…blowing snow and resultant poor visibilities caused a 46-car pile-up on I-25 in the middle of the city on the 4th. During the period…2 to 3 hour delays were common at Stapleton International Airport where snowfall from the storm totaled 4.3 inches and northeast winds gusted to 30 mph on the 1st. Intense cold accompanied the storm. Temperatures in Denver stayed below zero continuously for the best part of 3 days (3rd…4th…5th)…for a total of 69 hours. This is the fourth longest sub-zero period on record. Wind chill temperatures reached 50 degrees below zero. The mercury dipped to 24 degrees below zero on the 5th…setting a record for the date. This was the city’s coldest temperature in over 26 years. Low temperatures dipped below zero on 8 consecutive days (2nd-9th). High temperature of 9 degrees below zero on the 4th was a record low maximum for the date…as was the high of 5 degrees on the 5th. Extensive damage occurred when pipes and water lines froze and broke. Thousands of cars failed to start. On the 3rd…a 57-year-old woman died of hypothermia in an Arvada park. Eighteen high school students were treated for hypothermia after a 2-hour ride through Jefferson County in an unheated bus. At least 2 cases of frostbite were reported; there were undoubtedly many more.


In 1883…a protracted cold period occurred when low temperatures dipped below zero for 9 consecutive days. Low temperatures ranged from 22 degrees below zero on the 4th to 2 degrees below zero on the 1st and 6th. High temperatures ranged from 10 below zero on the 3rd to 23 on the 9th. Several temperature records were set that still stand today. Record lows of 18 below and 22 below zero occurred on the 3rd and 4th. Record low maximum readings of 2 below and 10 below zero occurred on the 2nd and 3rd. The high of only 10 below zero on the 3rd is the coldest maximum temperature ever recorded in Denver.


In 1982…a cold surge of arctic air brought light snow and sub-zero temperatures to metro Denver. Temperatures plunged to 6 below zero at midnight on the 3rd and never warmed above zero on the 4th as snow flurries continued. High temperature on the 4th of 1 below zero was a record low maximum. The temperature dipped to a record low of 15 below zero on the 5th.


In 1932…wind gusts estimated at 70 mph occurred in Boulder. A 60 mph wind gust was recorded to the east of Boulder in Valmont. Damage was minor.

In 1959…heavy snowfall totaled 5.8 inches at Stapleton Airport where northwest winds gusted to 30 mph on the 4th.

In 2001…high winds developed for a brief time overnight. Winds gusted to 75 mph atop the Gamow Tower on the University of Colorado campus in Boulder. Northwest winds gusting to 37 mph warmed the temperature to a high of 57 degrees at Denver International Airport.


In 1986…10 inches of snow fell in Boulder…in the foothill town of Wondervu southwest of Boulder…and at Evergreen west of Denver. Snowfall totaled 2.4 inches at Stapleton International Airport…where north winds gusted to 20 mph on the 6th.


In 1885…west winds were sustained to 42 mph in the city near daybreak.

In 1902…northwest winds sustained to 48 mph with gusts to 53 mph warmed the temperature to a high of 53 degrees.

In 2006…high winds developed briefly along the foothills… Extending from Golden to near Boulder. Peak wind reports included 92 mph at the National Wind Technology Center on Rocky Flats with a gust to 84 mph in Golden. North winds gusted to 43 mph at Denver International Airport.

In 2011…heavy snow fell in the foothills of Douglas… Jefferson and Park counties. Storm totals included: 19 inches…3 miles southwest of Conifer; 17.5 inches…4 miles south-southeast of Pinecliffe; 14 inches…5 miles east-southeast of aspen park; 12.5 inches…7 miles southwest of Boulder and at Genesee; 12 inches at Strontia Springs dam…10.5 inches at Roxborough state park; and 10 inches…3 miles east-southeast of tiny town. In the western and southern Denver suburbs and palmer divide…storm totals included: 9 inches near Louviers and 3 miles south-southeast of Morrison; 8 inches at Ralston Reservoir…7 inches in Lakewood…6.5 inches…2 miles southeast of Highlands Ranch and 6 inches in Englewood. Snowfall totaled 1.2 inches at Denver International Airport.


In 2003…heavy snow fell in the foothills. Snowfall totals included: 17 inches at Genesee; 16 inches at Lookout Mountain; 11 inches at Chief Hosa near Indian Hills…and 7 miles southwest of Boulder; 10.5 inches atop gold hill; and 10 inches at Intercanyon and near Conifer. Only 2.2 inches of snowfall were measured in the city at the site of the former Stapleton International Airport.


In 1978…the 5th marked the start of a record 7 consecutive days of dense fog at Stapleton International Airport. The heavy fog reduced the visibility to 1/4 mile or less for a period of time on each of these days. Light snow and/or freezing drizzle occurred on most days. Fog reducing visibility to less than 7 miles was recorded at Stapleton International Airport on 11 consecutive days through the 15th. During the period 5-14…the cold thick fog deposited heavy rime ice up to 5 inches thick on power lines and poles over a wide area of eastern Colorado…causing a major electrical power outage disaster.


In 1899…the temperature dipped to a low of 22 degrees below zero.


In 1929…5.0 inches of snow fell in downtown Denver behind a Canadian cold front. Temperatures plunged…but no records were set. Low readings dipped to 3 degrees below zero on the 6th and 9 degrees below zero on the 7th. Highs climbed to 5 degrees on the 6th and to only 1 degree below zero on the 7th.

In 1933…post-frontal light snowfall totaled 3.0 inches over downtown Denver. Northeast winds were sustained to 28 mph with gusts to 32 mph on the 6th. The very cold air mass plunged temperatures from a high of 60 degrees on the 5th to lows of 10 degrees below zero on the 6th and 16 degrees below on the 7th. High temperature of only 4 degrees below zero on the 7th was a record low maximum for the date.

In 2019…a storm system produced a period of light to moderate snowfall. Storm totals included: 7.5 inches in Boulder…7 inches in Broomfield and Lakewood…6.5 inches in Lafayette… 6 inches at Lyons; 5.9 inches at the National Weather Service in Boulder with 5 inches in Arvada. At Denver International Airport…3.1 inches of snowfall was observed.


In 2020…a strong upper level jetstream coupled with a very deep fetch of Pacific moisture…produced a prolonged period of heavy snow and strong winds in the mountains. Peak wind gusts above timberline ranged from 55 to 65 mph. The winter storm made travel nearly impossible at times…including Interstate 70 west of Georgetown. In the Front Range mountains and foothills…storm totals included: 40 inches at Loveland Ski Area; 33 inches near Berthoud Summit; 30 inches at Eldora and Winter Park ski areas; 26 inches at Aspen Springs; 16 inches around Evergreen. Elsewhere storm totals included: 11 inches in Littleton and Wheat Ridge; 10 inches near Cherry Hills Village…with 7 inches at Centennial Airport. At Denver International Airport…5.3 inches of snowfall was observed.


In 1933…3:00 pm on the 6th marked the start of a protracted cold period through 8:00 am on the 10th when the temperature was below zero for 86 out of 88 hours. The cold period was interrupted on the 8th at 9:00 am when the temperature was 1 degree above zero and at 10:00 am when the temperature was 8 degrees above zero. Four temperature records were set. High temperatures of 4 degrees below zero on the 7th…8 degrees on the 8th…and 5 degrees below zero on the 9th were record low maximums for those dates. The only record low temperature record was 14 degrees below zero on the 10th. The lowest temperature reached during the period was 16 degrees below zero on both the 7th and 8th…which were not records. » Click here to read the rest of February 5 to February 11: This week in Denver weather history

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Thornton’s February 2023 weather preview: Temps begin to warm, snow can be elusive

Saturday, February 4th, 2023 5:26am MDT

February in Colorado typically brings to an end an extended period when average temperatures are at their lowest. Winter begins to loosen its grip and temperatures get warmer but precipitation is not a particularly common event during the month.

Thus far, our snow season has been a bit of a disappointment although January did help and the start of February offers some relief. February is only our sixth snowiest month so we can’t count on much else.

Temperatures however do usually see a nice rebound during the month. Average high temperatures climb from an average of 44 degrees at the start to 50 degrees by the end of February.

For the complete February preview including a look at historical averages and extremes as well as a look at what long range forecasts are predicting, click here. 

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January 2023 weather recap: Thornton experiences a cold and snowy month

Friday, February 3rd, 2023 4:04pm MDT
Thornton, Colorado January 2023 Temperature Summary. (ThorntonWeather.com)

Thornton, Colorado January 2023 Temperature Summary. (ThorntonWeather.com)

You likely could have guessed the overall summary for the month, one that is summed up with two words: cold and snowy. January 2023, in fact, goes into the books as the second coldest and one of the snowiest Januarys of the past 17 years.

Overall, Thornton’s January saw an average temperature of 27.4 degrees. This is more than 3 degrees below the 17-year running average for the month of 30.7 degrees. It is also the second coldest January over that time span.

Temperatures ranged from a high of 62.4 degrees on the 14th down to a bone-chilling -3.7 degrees on the morning of the 30th.

Most notable was the big chill that descended at the end of the month resulting in four days of below freezing high temperatures. Additionally, the first five days of the month and 13 of the last 14 days of the month recorded below normal high temperatures.

For Denver, as measured at Denver International Airport, the Mile High City was actually colder with an average temperature for the month of 25.0 degrees. This was well below Denver’s January average of 31.7 degrees and the 17th coldest January on record for Denver.

Denver saw its warmest temperature of 59 degrees on the 14th and its coldest, -10 degrees, on the 30th.
In terms of precipitation, Thornton saw nearly double its January average. We recorded 0.85 inches in the bucket between rain and snowmelt. That is far above our 17-year running average for the month of 0.43 inches.

Out at the airport, Denver reported a healthy 1.25 inches of precipitation, besting our mark. That is well above their long-term January average of 0.38 inches. It also puts January 2023 into the record books as the 8th wettest January on record in Denver.

As you might infer from the precipitation totals, snowfall as well came in above normal.

Thornton recorded 11.2 inches of the white stuff. This was well above the 17-year average of 6.9 inches. It makes the month the 4th snowiest January of the past 17 years.

Denver bested us here as well with 13.0 inches. That is exactly double the 6.5 inches January average for the Mile High City since 1882. January 2023 goes into the books as tied with January 1989 as the 15th snowiest January in Denver.

Click here to view Thornton’s complete January 2023 climate summary report.


Thornton, Colorado January 2023 Precipitation Summary. (ThorntonWeather.com)

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Thornton’s weekend to offer up dry conditions, relatively warm temperatures

Friday, February 3rd, 2023 4:56am MDT

Not too shabby of a weekend for us. While it may not be truly “warm”, after the recent cold, temperatures will definitely be an improvement and make it far easier to be outside.

For today, we start out with sunny skies then this afternoon will see some high clouds. Overall conditions will be calm with highs topping out around 50 degrees. Tonight, mostly cloudy skies will be overhead with lows in the mid-20s.

Saturday brings partly sunny skies initially then cloud cover should decrease. Highs will again top out around 50 degrees with some breezy winds thrown in the mix. Saturday night, lows again dip to the mid-50s under partly clear skies.

Sunday rounds things out with partly sunny skies and overall calm conditions. Highs will be in the upper 40s.

Get out and enjoy it!

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Thursday brings temperatures near normal, sunny, calm conditions

Thursday, February 2nd, 2023 5:01am MDT

A tranquil day ahead for Thornton as conditions continue to warm. We will enjoy lots of blue sky above and mercury readings will be right near average for the date.

Sunny skies start us off this morning and will continue throughout the day. Light winds will be out of the south, conditions dry. Look for highs to top out near the average high of 44 degrees, perhaps a couple of degrees above that.

Tonight, skies will be mostly clear with lows dipping to around 20 degrees.

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Thornton to break above freezing, enjoy lots of blue sky

Wednesday, February 1st, 2023 5:04am MDT

After four days with highs below the freezing mark, today we should – finally – get above it. It will still be chilly, however, but we will enjoy lots of sun above.

In many ways, today looks a lot like yesterday. Sunny skies will be above throughout with calm conditions. High temperatures should get up to the mid-30s.

Tonight, skies remain mostly clear with lows in the teens.

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January 2023 top shots: Monthly photo slideshow

Tuesday, January 31st, 2023 8:10am MDT
Snow and fog start off the New Year. (Tony's Takes Photography)

Snow and fog start off the New Year. (Tony’s Takes Photography)

As one of our coldest months, January can be a good month to hibernate inside and avoid the outdoors.  But, like any month in Colorado, photo opportunities abound as our monthly slideshow demonstrates.

Snow is not normally dominant in the month but when it does fall, it can create a beautiful blanket of white.  Throw in the amazing sunrises and sunsets we receive in the middle of winter as well as wildlife and a host of other subjects and the imagery can be quite beautiful and stunning.

  • Slideshow updated January 31, 2023
  • 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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The sun returns to Thornton on Tuesday but chilly temps will linger

Tuesday, January 31st, 2023 5:04am MDT

Overall, a much improved day of weather for us. We will still see temps well below normal as we fight off the cold air and snow cover but it won’t be near as cold as the last couple of days and the sun stages a return.

Look for sunny skies to be above throughout the daytime hours. Overall, conditions will be calm and cold. Look for highs to top out in the mid to upper 20s.

Tonight, skies remain mostly clear with lows dipping down into the single digits.

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Denver sets record low maximum for January 30

Monday, January 30th, 2023 11:59pm MDT

Record Cold Temperatures

Yeah, it definitely did not get very warm today and the record books now reflect that. After tying a record low this morning, now we have a new record low maximum.

As measured at Denver International Airport, the Mile High City only saw a high temperature today of 4 degrees. This breaks the previous record low maximum of 4 degrees set more than 100 years ago in 1918.

Here in Thornton, we managed to stay a bit warmer, topping out at 11 degrees.

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