Thornton, Colorado, USA
UpdatedThu, 04-Mar-2021 9:30pm 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

Wednesday to offer up warm, windy weather conditions for Thornton

Wednesday, October 14th, 2020 5:07am MST

After a one-day break, the wind returns today and temperatures will remain warm. This afternoon, a cold front will move through chilling things out but offering no precipitation.

Partly sunny skies will be the general rule throughout the day today. Winds have been breezy since midnight and will be picking up speed by mid-morning. This afternoon, gusts of 40+ mph will be possible. High temperatures today will push to the upper 70s.

The wind coupled with low humidity and dry fuels has prompted a Red Flag Warning for the period from 9:00am to 6:00pm. Please be careful as the fire danger is very high.

The cold front arrives this afternoon and that will lead to decreasing temperatures after about 3:00pm. Tonight, winds will ease and become calm after midnight. Temperatures will be dropping quite a good ways and skies will clear. Look for overnight lows close to the freezing mark.

Keep an eye on those wind speeds here.

Join the Discussion - Post your commentJoin the Discussion!

Lots of sun, mild temperatures for Thornton’s Tuesday

Tuesday, October 13th, 2020 5:39am MST

After a couple of windy days, we have a nice looking fall day in store for us today. We’ll enjoy lots of sun and temps above normal.

Sunny skies start us off and while there may be a few clouds later today, they won’t be intrusive. High temperatures today will top out in the upper 70s, possibly hitting the 80 degree mark. Winds should be relatively benign most of the day, picking up in the evening and overnight hours.

Tonight, partly cloudy skies will be above with overnight lows dropping to around 50 degrees.

Join the Discussion - Post your commentJoin the Discussion!

Temps a bit above normal, breezy winds for Thornton’s Monday weather

Monday, October 12th, 2020 5:07am MST

Mild temperatures and dry conditions kick off our workweek. We will again have some wind although it shouldn’t be as powerful as the big blow yesterday.

The day starts off with sunny skies then this afternoon just a few clouds will arrive. Highs will top out in the low to mid-70s. Winds will be picking up by mid to late morning and continue through the evening. Gusts to 30mph or so can be expected.

The wind coupled with dry fuels and low humidity has prompted a Red Flag Warning that will be in effect from noon to 6:00pm. Fire danger is quite high so please be careful.

Tonight, winds will settle down after dark and skies will be mostly clear. Overnight lows will dip to the low 40s.

Keep an eye on those wind speeds with our live gauges here.

Join the Discussion - Post your commentJoin the Discussion!

October 11 to October 17: This week in Denver weather history

Sunday, October 11th, 2020 5:07am MST

This Week in Denver Weather History

A very eventful week of weather in Denver weather history. Many notable items have occurred and many also incorporate one of two conditions – wind or snow. Probably the most famous event was the Bronco Blizzard on October 15, 1984. That storm which hit its height during a Monday Night Football game between the Broncos and the Packers is probably one of the most memorable ever for longtime Denver residents.

From the National Weather Service:


In 1986…the first significant snowstorm of the season produced 2 to 5 inches of snow over metro Denver with 5 to 10 inches in the foothills west of Denver. Wondervu recorded the most snow from the storm…13 inches. The heavy wet snow caused numerous power outages. The storm was accompanied by strong north winds with gusts to 41 mph recorded on the 10th. The first snowfall of the season totaled 3.1 inches at Stapleton International Airport with only one inch on the ground due to melting. The strong cold front accompanying the storm cooled the temperature from a high of 73 degrees on the 10th to a high of only 33 degrees on the 11th…which was a record low maximum for the date.


In 1969…the second heavy snowstorm in less than a week dumped nearly a foot of snow across metro Denver and plunged the area into extremely cold temperatures for so early in the season. Snowfall totaled 11.0 inches at Stapleton International Airport. North winds gusting to 26 mph produced drifts up to 2 feet deep. Temperatures dipped from a high of 52 degrees on the 10th to a record low for the date of 10 degrees on the 12th. There was additional damage to trees and power and telephone lines from heavy snow accumulations and icing. Travel was restricted or blocked by drifting snow in both the mountains and on the plains east of Denver.


In 1997…damaging winds ahead of an approaching storm system developed in the foothills and spread across metro Denver. Winds gusted to 88 mph at Conifer…71 mph at the National Center for Atmospheric Research on the mesa in Boulder… And 53 mph at Denver International Airport. Several trees and street signs were blown down with scattered power outages reported throughout metro Denver. In Arvada…a car window was blown out by a strong wind gust.

In 2013…high winds occurred in and near the Front Range foothills. Peak gusts included: 85 mph at Rooney Road… 84 mph…2 miles south of Marshall; 82 mph at Rocky Flats National Wind Technology Center and Wondervu; 79 mph at the mesa lab at NCAR and 75 mph…3 miles south-southwest of Boulder; 73 mph in superior and 68 mph in Golden. The wind downed trees and power lines. As a result…scattered electrical outages affected 20000 xcel energy customers through the morning hours. The main outages affected the cities of Boulder…Golden and Lakewood. Smaller outages were reported in areas of Gold Hill…Ward… Westminster and Wheat Ridge.


In 1901…an apparent cold front produced northeast winds sustained to 42 mph with gusts to 48 mph on the 11th. General rain changed to snow overnight and totaled 2.0 inches. This was the first snowfall of the season. Total precipitation was 0.32 inch.


In 1892…apparent post-frontal rainfall totaled 3.33 inches in downtown Denver over the 3 days. A trace of snow on the 12th melted as it fell. Rainfall of 2.58 inches on the 12th into the 13th was the greatest 24-hour precipitation ever recorded during the month of October. Northwest winds were sustained to 48 mph with gusts as high as 55 mph on the 12th.


In 1873…smoke from several very large forest fires was sighted along the mountains.

In 1923…post-frontal rain changed to snow and totaled 4.0 inches. North winds were sustained to 14 mph.

In 1978…northeast winds gusting to 35 mph with a strong cold front briefly reduced visibility to 2 miles in blowing dust at Stapleton International Airport.


In 2001…overnight peak wind gusts to 82 mph and 70 mph were measured atop Niwot Ridge and Squaw Mountain… Respectively.


In 1969…record breaking extremely cold temperatures for so early in the season occurred. The high temperature of 26 degrees on the 13th was two degrees lower than the previous record minimum temperature of 28 degrees for the date set in 1885. The high temperature of 24 degrees on the 12th exceeded the record low temperature (22 degrees set in 1885) for the date by only 2 degrees. In addition… 3 new record low temperatures for the dates were set. The low temperature dipped to 10 degrees on the 12th breaking the old record (22 degrees in 1885) by 12 degrees. On the 13th the mercury plunged to a low of 3 degrees breaking the old record (28 degrees in 1885) by 25 degrees. On the 14th the temperature reached a minimum of 4 degrees breaking the old record (25 degrees in 1966) by 21 degrees.


In 1990…strong downslope winds stirred up clouds of dust and gravel…rattled windows…and stripped autumn-colored leaves from trees in Boulder. A wind gust to 78 mph was clocked in southwest Boulder…while a 96 mph gust was recorded in northwest Boulder. West winds gusted to only 36 mph at Stapleton International Airport.


In 1910…light smoke from nearby forest fires drifted over the city.

In 1966…the first measurable snow of the season caused widespread damage to trees and shrubs. The heavy wet snow totaled 6.9 inches at Stapleton International Airport where north-northwest winds sustained at 20 to 25 mph and gusting to 45 mph caused much blowing and drifting snow. South and east of Denver…up to a foot of snow fell. Heavy wet snow accumulations followed by freezing temperatures and strong winds resulted in extensive damage to trees…cars… And utility lines by falling limbs. A woman was killed by a falling snow laden tree limb in Denver. Several other people received minor injuries from falling tree limbs.

In 1987…rain drenched metro Denver. The South Platte Canyon area southwest of Denver received the most with 1.11 inches at Kassler and 1.49 inches upstream at Strontia Springs. At Stapleton International Airport…0.62 inch of rain was measured…northwest winds gusted to 29 mph…and thunder was heard.

In 2007…a new 24-hour record of 2.65 inches of precipitation was set at Denver International Airport for the month of October; breaking the previous record of 2.58 inches set in 1892.


In 1873…smoke from several large forest fires in the mountains made the air very hazy in the city.


In 1952…the first measurable snowfall of the season left 1.2 inches of snow at Stapleton Airport. North winds gusted to 38 mph.

In 1974…rain changed to snow early in the day…but snowfall totaled only 1.0 inch at Stapleton International Airport where northeast winds gusted to 20 mph.


In 1871…a terrible wind occurred during a snow storm in the foothills above Boulder. Damage was minor.

In 1878…high winds reached sustained speeds of 60 mph at times.

In 1911…post-frontal northwest winds were sustained to 41 mph with gusts to 43 mph.

In 1948…strong winds struck the Boulder area. Winds averaged 50 mph at valmont just east of Boulder. Wind gusts in excess of 60 mph were recorded at the Boulder airport. Wind gusts to 40 mph briefly reduced the visibility to 1 1/2 miles in blowing dust at Stapleton Airport.

In 1980…a rare October tornado touched down in Boulder… Damaging a vocational training building and throwing three nearby cars together damaging them extensively. A mile and half away several camper vehicles were thrown 200 feet. The storm also produced 1 inch diameter hail in the Boulder area.


In 1928…a thunderstorm produced hail shortly after midnight on the 15th. Rain changed to snow by evening. Through the afternoon of the 16th…the heavy snowfall totaled 7.3 inches in the city. North winds were sustained to 23 mph on the 15th.

In 1984…the heaviest October snowstorm in several years hit eastern Colorado with a vengeance. The storm was known as the “Bronco Blizzard” since it occurred during a nationally televised Monday night football game in Denver. One to two feet of snow fell near the foothills in west metro Denver with 2 to 3 feet in the foothills. Wind gusts up to 55 mph whipped the snow into drifts as high as 4 feet. The storm closed schools…roads…and airports. I-70 was closed both east and west of Denver. I-25 was closed south to Colorado Springs. Flights were delayed for several hours at Stapleton International Airport. Power outages were widespread. Snowfall totaled 9.2 inches at Stapleton International Airport where north winds gusting as high as 40 mph caused frequent surface visibilities of 1/4 to 1/2 mile in moderate to heavy snow and blowing snow overnight. The high temperature of only 35 degrees on the 15th was a record low maximum for the date.


In 1989…an autumn snowstorm hit metro Denver with 2 to 6 inches of snow. Snowfall totaled 4.4 inches at Stapleton International Airport where the maximum snow depth on the ground was only 3 inches due to melting and north winds gusted to 25 mph on the 15th. The heavy wet snow caused leafy branches to sag onto power lines…resulting in a number of power outages. Five thousand homes were blacked out in Boulder on the 16th. Up to a foot of snow fell in the higher foothills with 19 inches recorded at Echo Lake.


In 1878…high winds reached sustained speeds of 60 mph.

In 1998…one of the costliest hail storms to ever hit metro Denver caused an estimated total of 87.8 million dollars in damage to homes…commercial buildings…and motor vehicles. At the time the storm was ranked as the 7th costliest ever. The hailstorm…rare for so late in the season…began over portions of Arvada…Wheat Ridge…and northwest Denver where mostly pea sized hail accumulated up to a depth of 6 inches near I-70. Several accidents were attributed… At least in part…to the hailstorm. Snowplows had to be called out to clear several city streets. The storm intensified as it moved to the east…into the Denver and Aurora areas. Large hail…up to 2.00 inches in diameter pounded east and southeast metro Denver. Two inch diameter hail fell in the city of Denver and at Buckley Field. Hail as large as 1 1/2 inches was measured in south Denver with 1 inch diameter hail in northern Aurora.

In 1999…upslope conditions produced snow across metro Denver with heavy amounts in the nearby foothills. Snowfall totals included: 9 inches at Eldorado Springs; 8 inches at Genesee… Golden gate canyon…Littleton and near Morrison; 7 inches near Nederland; and 6 inches in Louisville. Snowfall totaled 3.6 inches at the site of the former Stapleton International Airport.


In 1990…strong downslope winds raked the eastern foothills. Wind gusts from 60 to 75 mph were common. Strong winds in metro Denver resulted in wave damage to a dock used to moor several private sail boats at Cheery Creek Reservoir. Damage was confined to the dock and two anchor cables. A northwest wind gust to 43 mph was recorded at Stapleton International Airport.


In 1878…strong winds reached sustained speeds of 48 mph.

In 1988…a wind gust to 62 mph was recorded in central Boulder. The strong winds caused a few brief power outages. An old smoldering brush fire in the foothills west of Boulder was re-ignited by the wind gusts.

In 1994…winds gusted to 85 mph atop Squaw Mountain…5 miles south of Idaho Springs.

In 2006…a potent storm system brought heavy snowfall to the mountains and eastern foothills. Snowfall totals in the foothills included: 14 inches at Blackhawk…13.5 inches near Idaho Springs…13 inches at Cabin Creek…12.5 inches at aspen springs and Echo Lake…11.5 inches at Georgetown and Rollinsville…10.5 inches near Jamestown…and 10 inches at Grant and Lake Eldora. Lesser snow amounts…from 4 to 9 inches…were recorded elsewhere in the foothills. Snowfall totaled only 3.5 inches in the Denver Stapleton area. At Denver International Airport…north winds gusted to 31 mph.

In 2012…a brief but powerful windstorm associated with a fast moving cold front across the urban corridor and adjacent plains during in the evening. Peak wind gusts ranging from 58 to 71 mph downed trees and power lines which damaged homes and vehicles. Several temporary structures were also damaged. Approximately fifty thousand were left without power in the Denver…Fort Collins and Greeley areas. Some schools were closed the following day until power could be restored. Around the Denver area…peak wind gusts included: 69 mph in Golden…64 mph at Littleton…  62 mph at Buckley AFB and in Denver…near the intersection of Walnut St. and interstate 25…and Longmont; 59 mph at Centennial Airport…58 mph at Denver City Park… Highlands Ranch.  At Denver International Airport…a peak wind gust to 35 mph was observed from the northwest.


In 1908…a moist…heavy…wet snowfall totaled 13.0 inches in downtown Denver over the 3 days. Rain from early morning on the 17th changed to snow by late afternoon and continued through the late morning of the 19th. Due to temperatures in the 30’s and melting…the most snow on the ground was only 5.0 inches at 6:00 pm on the 18th. Northwest to northeast winds were sustained between 12 and 20 mph during the storm. Precipitation totaled 1.82 inches.

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s weekend to continue the mild weather, dry conditions

Friday, October 9th, 2020 4:51am MST

Not a lot of change in the three-day weather forecast. Temperatures are going to remain above normal and the only chance for precipitation will be minimal.

For Friday, mostly sunny skies will be above with, as has been the norm, some periods with smoke / haze. Highs will be in the mid-80s. Tonight, partly cloudy skies will be above with lows in the mid-40s.

Saturday offers more of the same. Look for highs in the mid-80s under sunny to mostly sunny skies. Saturday night into Sunday morning, skies will be mostly clear with lows around 50 degrees.

Sunday does mix things up, but only slightly. A weak cold front will cool things down with highs in the mid-70s. It will be mostly sunny for much of the day with the afternoon and evening bringing just a slight chance for a shower.

Have a great weekend!

Join the Discussion - Post your commentJoin the Discussion!

Potentially record-setting warmth, smoke to highlight Thornton’s Thursday weather

Thursday, October 8th, 2020 5:09am MST

It doesn’t take much effort to create recent weather forecasts as they are pretty much the same day to day. That continues today with another day of very warm temperatures, dry conditions and smoky skies.

Sunny skies with some thin cirrus clouds will be above throughout the day, but with smoke from the wildfires again. Temperatures today will top out in the mid-80s. Denver’s record high for the date is 85 degrees and it is likely the reading at DIA will exceed that.

Tonight, skies will be mostly clear with some smoke, lows will drop to around 50 degrees.

Join the Discussion - Post your commentJoin the Discussion!

Wednesday brings a repeat of very mild temperatures, dry conditions

Wednesday, October 7th, 2020 4:51am MST

Yeah, the weather forecasts these days sound like a broken record with above normal temps and no precipitation being the repeating pattern. Look for those same conditions today and through the rest of the workweek.

Sunny skies start us off and will continue through the day. Once again, some haze from smoke will be expected. Highs today will top out in the mid to upper 80s, well above the average for the date of 69 degrees.

Tonight, mostly clear skies will be above with overnight lows in the mid-40s.

Join the Discussion - Post your commentJoin the Discussion!

Tuesday temperatures to continue to climb, may push into record-setting territory

Tuesday, October 6th, 2020 4:56am MST

No break from the heat for us yet. We are going to see even warmer temperatures today along with dry conditions and areas of smoke.

Sunny skies start the day off and will be with us throughout. Areas of smoke can be expect this afternoon and evening. High temperatures today will top out near 87 degrees. That is also the record high for the date, set in 1975.

Tonight, skies will remain clear with overnight lows dipping to the mid-40s

Join the Discussion - Post your commentJoin the Discussion!

Mild temperatures but some breezy winds, increased fire danger for Thornton’s Monday

Monday, October 5th, 2020 5:42am MST

We kick off the workweek with a continuation of the mild, dry conditions of recent weeks. In fact, we can expect more of the same through the entire workweek and into the weekend.

Today starts off with sunny skies that will be with us for the entire day. There may be some smoke later in the day and into the evening. Winds will be becoming breezy around mid-morning and last into the evening. Look for highs today in the low 80s.

The breezy winds, low humidity and dry conditions have prompted a Red Flag Warning to be issued due to the increased fire danger. It will be in effect from 11:00am to 5:00pm. Please be careful!

Tonight, skies will be clear with overnight lows in the mid-40s.

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s October 2020 preview: Cooler, calm conditions typical for the first full month of fall

Monday, October 5th, 2020 5:09am MST

Thornton, Colorado October weather preview.With the first full month of fall here, October usually brings one of the quietest weather months in the Denver area with plenty of mild, sunny days and clear, cool nights.

October is historically the second sunniest month and conditions are generally calm.

However we also will usually see our first taste of winter during the month with the first freeze and first snowfall of the season.  Temperatures as well will start to drop and by the end of the month the average nighttime lows are below freezing.

For complete details on our historical October weather and what we can expect in the coming month, read our complete October weather preview here.

  • Don’t miss a thing when it comes to our ever-changing weather! Be sure to ‘like’ us on Facebook, follow us on Twitter and add us to your Google+ circles.
Join the Discussion - Post your commentJoin the Discussion!