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


ThorntonWeather.com on Twitter

ThorntonWeather.com on Facebook


Weather Geek Stuff - weathergeekstuff.com

Rocky Mountain Weather Network

Tony's Takes Photography


Recent News and Posts

Denver sets a new record high temperature for November 6

Saturday, November 6th, 2021 3:20pm MST

Record High Temperature

The forecasts calling for a very mild weekend are beginning to bear out with one record high set today and another possible tomorrow.

At 1:13pm this afternoon, as measured at Denver International Airport, the mercury climbed to 80 degrees. This bests the previous record high for November 6 of 79 degrees set in 1934. This also is the second warmest November temperature ever recorded (81 degrees on November 17, 2017).

Here in Thornton, we stayed a bit cooler, as usual, with our high topping out at 78 degrees.

Tomorrow’s forecast calls for similar mercury readings to today. The record high for November 7 is 78 degrees, set in 1999 so it is quite possible that mark will be tied or broken.

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s weekend to feature lots of sun, very mild temperatures

Friday, November 5th, 2021 5:03am MST

It is pretty hard to complain about forecasts like this one. We will enjoy three days of temps well above normal and overall calm, dry conditions.

For Friday, sunny skies will be the rule with highs in the low 70s. The afternoon will bring some breezy winds but nothing overly intrusive. Tonight, skies will be partly cloudy with lows in the mid-30s.

Saturday looks much like today. Sunny skies will again be above with highs in the low 70s. Saturday night, lows drop to the upper 30s under mostly clear skies.

Sunday closes things out in fine fashion. Look for highs in the low to mid-70s, again with sunny skies.

Get out and enjoy that weather!

Join the Discussion - Post your commentJoin the Discussion!

November 2021 preview: The transition to winter begins

Thursday, November 4th, 2021 5:04am MST

Thornton's November weather previewThe weather during the month of November in Denver metro area can offer just about anything.  While it is normally a quiet month, it can be prone to extremes.

November has historically been one of Denver’s snowiest months and major snowstorms are not entirely uncommon.  However conditions can also be quite dry.

Temperatures during the month continue to cool as we get closer to winter and by the end of the month the low temperatures routinely dip to 20 degrees or below.  At times it can in fact bring conditions more like what we see in January.

Get all the details on November’s weather and what we can expect in our complete preview here.

Join the Discussion - Post your commentJoin the Discussion!

Mild temperatures, lots of sun for Thornton’s Thursday

Thursday, November 4th, 2021 4:54am MST

The first of a nice looking string of days with pleasant conditions. Highs today will be about 10 degrees above normal with lots of that Colorado blue above.

There may be a few clouds early but then sunny skies will dominate above for the balance of the day. Overall conditions will be calm and dry with light winds out of the south. Highs today will top out in the mid to upper 60s.

Tonight, lows will be in the mid-30s with partly cloudy skies above.


Join the Discussion - Post your commentJoin the Discussion!

“Falling back” as Daylight Saving Time ends Sunday, November 7

Wednesday, November 3rd, 2021 8:03am MST
The United States returns to Standard Time at 2:00am Sunday as Daylight Saving Time comes to an end.

The United States returns to Standard Time at 2:00am Sunday as Daylight Saving Time comes to an end.

The biannual ritual of changing our clocks to adjust for Daylight Saving Time occurs this weekend, providing yet another signal of the changing of seasons.  The United States will ‘fall back’ one hour at 2:00am Sunday morning as we return to Standard Time.

The ritual of changing our clocks twice a year can be met with some resistance as some people struggle to adjust their body’s internal clock.  Others actually like the return to standard time as they get to enjoy an extra hour of sleep.

The time change definitely has big effects on the dawning of daylight and how early it gets dark in the evening.

Sunrise on Saturday occurs at 7:34am but on Sunday it will be at 6:35am. Similarly, sunset will occur at 5:52pm on Saturday but on Sunday the sun will disappear over the horizon at 4:51pm.

For many this means that when they get home from work it will now be dark and outdoor activities will be significantly curtailed as a result.

Arizona and Hawaii are the only states that do not observe Daylight Saving Time and remain on Standard Time year round.    The U.S. territories of Puerto Rico, American Samoa, Guam, Northern Mariana Islands, and the United States Virgin Islands also do not observe the event.

It won’t be all that long though before Daylight Saving Time returns.  On March 13, 2022 we will ‘spring forward.’

Daylight Saving Time Schedule

The mandated beginning and end of Daylight Saving Time has changed in the United States over the years.

The most recent schedule was set by the Energy Policy Act of 2005 and took effect in 2007.  We now ‘spring forward’ to begin Daylight Saving Time on the second Sunday in March and ‘fall back’ with the return to Standard Time on the first Sunday in November.

Daylight Savings Time Dates

Year DST Begins 2 a.m.
(Second Sunday in March)
DST Ends 2 a.m.
(First Sunday in November)
2021 14 March 2021 7 November 2021
2022 13 March 2022 6 November 2022
2023 12 March 2023 5 November 2023
2024 10 March 2024 3 November 2024
2025 9 March 2025 2 November 2025
2026 8 March 2026 1 November 2026
Join the Discussion - Post your commentJoin the Discussion!

Wednesday begins a warming trend that will last through the weekend

Wednesday, November 3rd, 2021 5:03am MST

After a few days of chilly, dreary weather we now return to some beautiful, fall weather. Today will be a transition day with temps a bit cooler than normal but with a good bit of sun above.

The morning starts off partly clear but by mid-morning, clouds will quickly dissipate and sunny skies will be above for the balance of the day. Overall conditions will be calm and dry. High temperatures today will top out in the mid-50s, cooler than normal but an improvement over the last few.

Tonight, overnight lows will drop to around freezing under mostly clear skies.

Looking ahead, temperatures will continue to warm and by the weekend we could be looking at the 70s. More in the extended forecast here.

Join the Discussion - Post your commentJoin the Discussion!

October 31 to November 6: This week in Denver weather history

Wednesday, November 3rd, 2021 4:09am MST

This Week in Denver Weather History

Frightening weather does not seem to be in the cards for our Halloween or the immediate future.  That however is not always the case as we look back at this week in Denver weather history.


In 1929…rain changed to snow on the afternoon of the 28th and continued until midday on the 30th followed by intermittent light snow which continued through the 31st. Snowfall over the four days totaled 16.2 inches in the city.  Most of the snow…8.5 inches…fell on the 29th with 6.1 inches on the 30th.  Temperatures hovered in 20’s during most of the storm.


In 1889…the first snowfall of the season totaled 14.0 inches over the three days in downtown Denver.  Snowfall was 8.0 inches on the 29th and 5.0 inches on the 31st.  North to northeast winds gusted to 30 mph on the 29th.

In 1950…a warm spell resulted in five daily temperature records.  Record highs of 84…80…and 79 degrees occurred on the 29th…30th…and 31st…respectively.  Low temperature of 49 degrees on the 30th was the record high minimum for the date.

In 1991…the second surge of cold arctic air in a matter of days plunged metro Denver into the deep freeze.  While low temperatures remained above zero…high temperatures were only in the 20’s.  Three temperature records were set: record lows of 7 degrees on the 30th and 10 degrees on the 31st and a record low maximum of only 21 degrees on the 30th.  Snowfall was light with only 1.9 inches recorded at Stapleton International Airport where east winds gusted to 23 mph.

In 2002…snowfall totaled 4.3 inches at the site of the former Stapleton International Airport.  North winds gusted to 32 mph on the 29th behind a cold front…which plunged temperatures well below seasonal normals.  High temperatures of 18 degrees on the 30th and 19 degrees on the 31st were record low maximums for each date.  Low temperatures dipped to 12 degrees on the 30th and 15 degrees on the 31st.


In 1972…heavy snowfall totaled 15.5 inches at Stapleton International Airport.  However…the heaviest snow occurred on Halloween night when 7 inches fell on trick-or-treaters during a short 3-hour period.  I-25 was closed south of Denver.  North winds gusting to 29 mph caused some blowing snow on the 1st.  The snow started late on the 29th and ended during the mid afternoon on the 1st.  The greatest snow depth on the ground at Stapleton International Airport was 13 inches on the 1st.


In 1997…high winds buffeted the foothills and adjacent areas of metro Denver.  West winds gusted to 70 mph in Broomfield and to 40 mph at Denver International Airport. The strongest winds occurred in the mountains west of Denver and in the foothills north of Denver.

In 2001…high winds developed in the foothills.  Peak wind gusts were measured to 74 mph at the National Center for Atmospheric Research on the mesa in Boulder and to 72 mph near Rollinsville.  West winds gusting as high as 53 mph warmed the temperature to a high of 71 degrees at Denver International Airport.


In 1951…6.4 inches of snowfall were measured at Stapleton Airport.

In 1989…a Halloween storm dropped 3 to 6 inches of snow on metro Denver with the adjacent foothills receiving 5 to 10 inches.  Snowfall totaled 4.5 inches at Stapleton International Airport…where north winds gusted to 31 mph on the 31st.  Most of the snow fell on the evening of the 31st…but the storm left icy streets throughout metro Denver on the morning of the 1st…making it a “spooky” commute for many motorists.

In 2004…heavy snow fell in and near the foothills of Jefferson and Douglas counties.  Storm total snowfall included:  14.5 inches in Aspen Park…10 inches at Roxborough State Park and near Sedalia…8 inches near Bergen Park…and 7 inches in Highlands Ranch.  Snowfall totaled only 3.2 inches in the Denver Stapleton area.  Post-frontal northeast winds gusted to 41 mph at Denver International Airport.


In 1896…northwest Chinook winds sustained to 40 mph with gusts to 46 mph warmed the temperature to a high of 60 degrees in the city.

In 1973…wind gusts to 92 mph were recorded in Boulder. West winds gusted to 41 mph at Stapleton International Airport where the Chinook winds warmed the temperature to a high of 70 degrees.

In 1989…a 39-year-old Lakewood man in a motorized wheelchair was found dead of exposure early in the morning after an overnight snowfall dumped 3 to 6 inches of snow across metro Denver.


In 1892…snowfall totaled 5.0 inches in downtown Denver. This was the only snow of the month.

In 1956…heavy snowfall totaled 7.0 inches at Stapleton Airport.  The storm was accompanied by much blowing and drifting snow.  North winds gusted to 47 mph.

In 1991…the storm system which hit the Front Range at the end of October finished the job during the start of November.  Six inches of new snow were recorded at both Rollinsville and Morrison…while 2.9 inches of snow fell at Stapleton International Airport where northeast winds gusted to 17 mph.  The temperature climbed to a high of only 19 degrees on the 2nd…setting a record low maximum for the date.

In 1995…a winter storm dropped 5 to 8 inches of snow in the Front Range foothills.  The exception was at Golden Gate Canyon where a foot of new snow was measured.  Icy roads…fog…and blowing snow along I-70 in the foothills west of Denver caused dozens of accidents.  One man was killed when he lost control of his vehicle and was ejected when his truck hit a median and rolled over.  At least 20 other accidents involved minor injuries.  Only 1.0 inch of snow fell at the site of the former Stapleton International Airport where some freezing rain also fell.


In 1939…a trace of snow fell over downtown Denver.  This snow…along with a trace of snow on the 9th…was the only snow of the month…ranking it…along with other months…the second least snowiest November on record.

In 1967…post-cold frontal heavy snowfall totaled 6.2 inches at Stapleton International Airport where north winds gusted to 29 mph…briefly reducing the visibility to 1/8 mile.

In 1992…the first major snowfall of the season dumped 4.6 inches of snow at Stapleton International Airport where north winds gusted to 26 mph.  Heavier amounts of snow fell in and near the foothills with 8 inches at Conifer… Empire…and Bailey…6 inches at Rollinsville and Golden Gate Canyon…and 4 inches at Morrison and Wheat Ridge.

In 2011…a storm system brought another around of moderate to heavy snow to the region. Areas in and near the Front Range Foothills and Palmer Divide were hit the hardest. Gusty winds also produced blizzard conditions at times along the Palmer Divide. In addition…the snow and blowing snow forced several school closures in Douglas and Weld Counties. Snow drifts…from 1 to 3 feet deep were reported in the northern portion of Douglas and Elbert Counties. Storm totals included: 14 inches…4 miles south of Boulder and 12.5 miles northwest of Golden…13 inches… 5 miles east-southeast of Aspen Springs; 12 inches near Allenspark and Parker; 11 inches…6 miles southwest of Castle Rock…Genessee…9 miles north-northeast of Elizabeth…10 inches…10 miles south-southeast of Buckley AFB. At the National Weather Service in Boulder… 7.9 inches of snow was recorded…with 4.5 inches observed at Denver International Airport.


In 1974…heavy snowfall totaled 6.1 inches at Stapleton International Airport where north winds gusted to 23 mph on the 3rd.  Most of the snow fell on the 3rd.  Maximum snow depth on the ground was 5 inches.

In 1990…a winter storm dumped 3 to 8 inches of heavy wet snow across metro Denver.  In the foothills snow amounts ranged from 4 to 10 inches.  Slushy snow and ice-covered roads snarled traffic.  The snow…ice…and poor visibilities were blamed for numerous traffic accidents.  Low clouds… Fog…and snow delayed air traffic at Stapleton International Airport for at least 90 minutes on the afternoon of the 2nd. Snowfall totaled 5.4 inches at Stapleton International Airport where north winds gusted to 21 mph.


In 1946…a major snow storm dumped 30.4 inches of heavy snowfall downtown and 31.0 inches at Stapleton Airport. The winter storm closed schools and disrupted all forms of transportation in the city.  The greatest depth of snow on the ground was 28 inches at the airport.  The duration of the snowfall…from 4:22 am on the 2nd to 3:08 am on the 5th… A total of 70 hours and 46 minutes…is the second longest period of continuous precipitation on record and the second heaviest snowfall of record at the time in Denver.  The 17.7 inches of snowfall on the 2nd and 3rd was the greatest 24- hour snowfall ever recorded during the month of November. Buses and street cars had a difficult time…and many cars were abandoned along roadsides and streets for several days. Secondary roads in rural areas were blocked for 2 to 3 weeks.  Several buildings in the city collapsed or were damaged from the weight of the heavy snow.  Football games were canceled.  Livestock losses were high over eastern Colorado.  The precipitation from this storm alone exceeded the greatest amount ever recorded in Denver during the entire month of November previously.  The precipitation recorded downtown was 2.03 inches…and the previous record for the entire month of November was 1.95 inches in 1922. North winds were sustained to 26 mph on the 2nd.


In 1940…the longest period without snow…200 days…ended on this date with the first snow of the season…a trace…on November 4…1940.  The last snow of the previous season… Also a trace…occurred on April 17…1940.

In 1959…a rare thunderstorm in November occurred around sunrise.  Rainfall measured only 0.02 inch at Stapleton Airport.

In 1993…periodic high winds buffeted the foothills west of Denver.  Wind gusts to 90 mph were recorded at Rollinsville in the foothills southwest of Boulder…while gusts to 85 mph were observed atop Squaw Mountain near Idaho Springs.  West winds gusted to 37 mph at Stapleton International Airport.

In 1996…a rare November thunderstorm during the early evening produced 0.10 inch of rain at Denver International Airport and only 0.06 inch of rain at the site of the former Stapleton International Airport.

In 2005…strong winds developed over the urban corridor. While the damaging winds were in the Fort Collins area… High winds also developed to the south of Denver in Douglas County.  Peak wind reports included 70 mph at Franktown…65 mph in Castle Rock…and 61 mph in Sedalia. West winds gusting as high as 47 mph warmed the temperature to a high of 69 degrees at Denver International Airport. Winds were strong and gusty for most of the daytime hours across metro Denver.


In 1994…a fast moving snow storm dumped 8 to 9 inches of snow on Boulder…Broomfield…and Lafayette.  Snowfall totaled only 1.8 inches at Stapleton International Airport where on the 3rd east winds gusted to 20 mph and some freezing drizzle fell.


In 1940…a trace of snow fell in downtown Denver.  This marked the start of the shortest snow season on record… 167 days…through April 19…1941…when 0.4 inch of snow fell.

In 1959…high winds caused damage in many areas of the eastern plains.  In Denver…winds averaged 40 mph with gusts to 70 mph.  Some damage was reported to utility lines…signs…and vehicles.  Northeast winds were sustained to 30 mph at Stapleton Airport.


In 1933…the first measurable snow of the season totaled only 2.5 inches.  This was the only measurable snow of the month.  Northwest winds were sustained to 27 mph on the 4th.

In 1951…heavy snowfall of 5.7 inches was measured at Stapleton Airport where northwest winds gusted to 32 mph.


In 1896…west Chinook winds sustained to 44 mph with gusts to 46 mph warmed the temperature to a high of 56 degrees in the city.

In 1919…a rare November thunderstorm produced a mixture of rain and snow during the evening.  Precipitation totaled only 0.14 inch with only a trace of snow. Northeast winds were sustained to 39 mph with gusts to 44 mph.

In 1948…a west-northwest wind gust to 50 mph was recorded at Stapleton Airport.

In 1994…winds gusted to 76 mph on the summit of Squaw Mountain…5 miles south of Idaho Springs.

In 2000…snow fell in the foothills west of Denver and across the southern suburbs.  Snow totals included 6 inches near Evergreen…11 miles southwest of Morrison… And 7 miles south of tiny town and 5 inches in Aurora and Parker.  Snowfall totaled 5.5 inches at the site of the former Stapleton International Airport.  Northeast winds gusted to 26 mph at Denver International Airport where the visibility was reduced to 1/4 mile in heavy snow at times.


In 1938…heavy snowfall totaled 7.5 inches over downtown Denver.  North winds were sustained to 16 mph with gusts to 19 mph on the 5th.


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.


In 1962…west winds gusted to 55 mph…briefly reducing the visibility to 1 1/2 miles in blowing dust at Stapleton Airport.  The strong winds blew all day.

In 1989…high winds to 62 mph were recorded in Boulder. Northwest winds gusted to 33 mph at Stapleton International Airport.

In 1991…strong westerly Chinook winds blew into metro Denver with gusts to 88 mph recorded at Rollinsville and to 51 mph in Boulder.  Later…northeast winds with gusts of 30 to 40 mph were common across all of metro Denver behind a cold front…which produced only 0.2 inch of snowfall at Stapleton International Airport.

Join the Discussion - Post your commentJoin the Discussion!

Tuesday to continue the chilly, unsettled weather conditions

Tuesday, November 2nd, 2021 5:07am MST

Today looks to offer up more of what we experienced yesterday. Cloudy skies, chilly temps and a chance for some light precipitation will repeat.

Don’t look for any blue today as cloudy skies will be above all day. Temperatures will remain on the chilly side with highs only topping out in the upper 30s / lower 40s. We will have varying chances for showers today, mostly in the form of sprinkles / light rain but perhaps a snowflake or two mixed in early.

Late afternoon and the evening bring a bit better chance to see shower activity. Skies will see a bit of clearing overnight with lows right around freezing.

Join the Discussion - Post your commentJoin the Discussion!

A chilly, cloudy day to start off Thornton’s workweek

Monday, November 1st, 2021 4:55am MST

We begin the workweek and the month of November with a somewhat dreary day. Temps will be well below normal with solid cloud cover and just a chance for precipitation.

Dawn will show cloudy skies and those will be with us throughout the day. High temperatures today will top out only in the mid-40s. There isn’t much moisture with this system so we expect much of the day to remain dry, perhaps a sprinkle toward the late afternoon.

Tonight, cloud cover will remain. We do have a better chance for precipitation but aren’t expecting much at all. As temps drop, we may see some snow in there but no accumulation is expected. Overnight lows will be in the upper 20s.

Join the Discussion - Post your commentJoin the Discussion!

October 2021 top shots: Monthly photo slideshow

Sunday, October 31st, 2021 6:01pm MST
An old homestead among fall colors in Park County. (Bill Hutchinson)

An old homestead among fall colors in Park County. (Bill Hutchinson)

October in Thornton can bring a wide variety of weather conditions, perfect for the photographer in all of us.

The month brings the changing of the colors at Colorado’s lower elevations and it is also is typically when we see our first freeze and first snow.

Couple those facts with our usual widely varying landscapes and wildlife and we have a month that is sure to bring in plenty of photo opportunities.

  • Slideshow updated October 31, 2021
  • 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!

Join the Discussion - Post your commentJoin the Discussion!