Thornton, Colorado, USA
UpdatedWed, 22-May-2019 11:25pm MDT 


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Temps a bit above normal, lots of sun, far less wind for Tuesday

Tuesday, January 8th, 2019 5:09am MDT

A very pleasant winter day ahead for Thornton. With sunny skies above, temps will be above normal most notably, winds will be calm as compared to yesterday.

Clear skies start things off and will continue through the day. There may be a cloud here and there but they won’t be amounting to much. Temperatures will top out close to 50 degrees, about 5 degrees above normal. Winds will generally be calm.

Tonight, partly cloudy skies will be overhead with lows dipping to the low 20s.

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Thornton’s workweek starts with warm temps but a good dose of wind

Monday, January 7th, 2019 5:01am MDT

Somewhat of a mixed bag of weather for us today. While we will again enjoy temperatures well above normal, strong, west winds are going to dim any enjoyment of the warmth.

We start out with mostly clear skies and should have more of the same throughout the day today. Temperatures will be topping out in the low to mid-50s.

The main story will be the wind, some of which we saw overnight. Speeds will be increasing this morning, peaking in early to mid-afternoon. At their height, gusts to 50mph will be possible. We will see things settle down as we get close to sunset, then turn calm by about 10:00pm.

Tonight, skies will be mostly clear with lows in the mid-20s.

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

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Warm weather to last through the weekend, clouds on the increase

Friday, January 4th, 2019 5:02am MDT

We have a pretty nice three day period of weather ahead for Thornton. Temperatures will continue to be above normal although a passing system will bring more clouds as the weekend progresses.

Friday will be the warmest and sunniest of the three days. Look for sunny skies to dominate with just a few clouds in the afternoon. Conditions will be calm and dry with highs topping out in the mid to upper 50s. Tonight, skies remain mostly clear with lows dipping to the mid-20s.

Saturday starts out mostly clear then we will see cloud cover increase in the afternoon. Temperatures will be slightly cooler with highs in the mid-50s. Saturday night, mostly cloudy skies will be above with lows below the 30 degree mark.

The weekend closes out on Sunday with temps remaining mild but with a good bit of cloud cover. Highs will be in the low to mid-50s under mostly cloudy skies.

Have a great weekend!

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Thornton’s Thursday warms up nicely with lots of blue sky above

Thursday, January 3rd, 2019 4:59am MDT

Our rebound from the cold continues. Today, temps climb to a good ways above normal with sunny skies above.

Clear skies start us off and while there might be a small cloud or two later, they won’t amount to much. Temperatures will be topping out right near 50 degrees. The average high for the date is 43 degrees.

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

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December 2018 weather recap: Warmer and much drier than normal

Wednesday, January 2nd, 2019 5:36am MDT

Thornton’s December was lacking in terms of any sort of real weather drama. Temperatures were relatively mild for much of the month and precipitation was fleeting.

Above normal temperatures were the general rule for the first part of the month. It was only the last week of the month when Arctic air arrived and we saw temperatures drop considerably. We saw only two measurable snow events, neither of which amounted to much.

Overall, Thornton’s average temperature for the month was 30.8 degrees. This was nearly a full degree above Denver’s long term December average of 30.0 degrees. Out at DIA where the Mile High City’s official measurements are taken, it was a good bit warmer with an average of 32.5 degrees.

Temperatures in Thornton ranged from a high of 60.6 degrees on the 21st down to a low of 4.5 degrees on the morning of the 29th. Denver’s warmest reading of 63 degrees also came on the 21st and its coldest, 0 degrees, on the 31st.

Denver averages 0.35 inches of precipitation during December. Thornton fell well short with a mere 0.07 inches. Out at the airport, even less was realized with 0.03 being recorded. This puts December 2018 into the books as one of the driest Decembers ever recorded.

Ten driest December’s in Denver weather history (since 1872):
0.00 – 1881
TRACE – 1905
0.01 – 1906, 1895
0.03 – 1977, 1931, 2018
0.04 – 2004, 1890
0.05 – 2002, 1995

Thornton recorded a mere 0.9 inches of snow during the month, the majority of which fell on the last day of the month. Denver saw 0.5 inches, all on the 31st.  Both fall well short of the long term Denver average for December snowfall of 8.5 inches and put December 2018 on the list of the ten least snowy Decembers recorded.

Ten least snowy December’s in Denver weather history:
TRACE – 1905, 1906, 2002
0.1 – 1928
0.4 – 1890
0.5 – 1935, 2018
0.6 – 1995
0.7 – 1977, 1895

Click here to view Thornton’s December 2018 climate report.

Thornton, Colorado's December 2018 Temperature Summary. (ThorntonWeather.com)

Thornton, Colorado’s December 2018 Temperature Summary. (ThorntonWeather.com)

Thornton, Colorado's December 2018 Precipitation Summary. (ThorntonWeather.com)

Thornton, Colorado’s December 2018 Precipitation Summary. (ThorntonWeather.com)

936 AM MST TUE JAN 1 2019




                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
 HIGH              79   12/05/1939
 LOW              -25   12/22/1990
HIGHEST            63   12/21        62       1       69  12/12
LOWEST              0   12/31        -4       4       -4  12/24
AVG. MAXIMUM     46.1              42.8     3.3     48.3
AVG. MINIMUM     18.8              17.1     1.7     18.0
MEAN             32.5              30.0     2.5     33.2
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      4               5.8    -1.8        4
DAYS MIN <= 32     31              29.4     1.6       28
DAYS MIN <= 0       1               2.0    -1.0        1

 MAXIMUM         5.21   1913
 MINIMUM         0.00   1881
TOTALS           0.03              0.35   -0.32     0.21
DAILY AVG.       0.00              0.01   -0.01     0.01
DAYS >= .01         1               4.1    -3.1        4
DAYS >= .10         0               1.1    -1.1        1
DAYS >= .50         0               0.1    -0.1        0
DAYS >= 1.00        0               0.0     0.0        0
 24 HR. TOTAL    0.03   12/31 TO 12/31

TOTALS            0.5               8.5

HEATING TOTAL     999              1086     -87      979
 SINCE 7/1       2372              2468     -96     2150
COOLING TOTAL       0                 0       0        0
 SINCE 1/1       1026               769     257      881

 EARLIEST     09/08/1962
 LATEST       06/08/2007
EARLIEST                        10/07
LATEST                          05/05

AVERAGE WIND SPEED              9.6

AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC             22


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After a very cold start, Wednesday will warm to near normal, offer clear skies

Wednesday, January 2nd, 2019 5:03am MDT

Thornton starts out with some bone-chilling cold but we will see a decent bit of warming. Temps will end of near normal with lots of sun above.

Clear skies start things off and will continue through the day. You will hard pressed to find a cloud today. After a start in the single digits, temperatures should warm to within a couple of degrees of the average high of 43 degrees for the date.

Tonight, skies will remain clear with lows dipping to the teens.

Keep an eye on the temps here.

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Thornton’s January 2019 preview: Cold temps the norm, snow can be fleeting

Wednesday, January 2nd, 2019 4:07am MDT

Denver's January weather and climatology preview for 2013.As we begin the new year the winter chill begins to set in.  While January can see its share of extremes, the month historically sees stable temperatures and is usually relatively dry.

January ranks as the second coldest month in Denver next to December with average temperatures remaining virtually the same from the start to the end of the month.

In terms of snowfall, the month only ranks as the fourth snowiest and it is not uncommon for it to be quite dry.

What does January 2019 hold for us?  Follow the link to find out.

For the complete January preview including a look at historical averages and extremes, click here. 

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December 30 to January 5: This week in Denver weather history

Tuesday, January 1st, 2019 9:14am MDT
This week in Denver weather history

December 30 to January 5: This week in Denver weather history

Cold, snow and wind are the dominant historical weather events for our look back at this week in Denver weather history.

From the National Weather Service:


In 1980…temperatures were unusually warm during the week between Christmas and New Year’s. High temperatures for the week ranged from the mid-50’s to the mid-70’s. Four temperature records were set. Record highs occurred on the 26th with 68 degrees…the 27th with 75 degrees…and the 30th with 71 degrees. A record high minimum temperature of 41 degrees occurred on the 27th.


In 1898…heavy snowfall totaled 6.2 inches in downtown Denver. Northeast winds were sustained to 35 mph with gusts to 40 mph on the 29th.

In 1912…strong winds buffeted Boulder…causing hundreds of dollars damage. The winds were described as one of the most terrific in the history of the city.

In 1923…a cold wave caused temperatures to plunge 58 degrees in 24 hours. The temperature was 54 degrees at 2:00 pm on the 29th and only 4 degrees below zero at the same time on the 30th. The low temperature of 14 degrees on the 29th was the high temperature on the 30th. The low temperature on the 30th dipped to 10 degrees below zero. Light snowfall totaled only 0.7 inch. Northeast winds were sustained to 23 mph on the 29th.

In 2008…very strong Chinook winds blasted areas in and near the foothills of Boulder and Jefferson counties. The wind blew down trees and power poles…downed electrical lines and fences…and damaged homes and vehicles. Scattered power outages were reported along the Front Range. In metropolitan Denver alone…24000 Xcel customers were affected by the outages. Four planed were damaged at the Vance Brand Municipal Airport in Longmont…one was heavily damaged. Insurance companies estimated up to 7 million dollars in damage. Peak wind gusts included 87 mph at the national wind technology center…86 mph…2 miles north of Longmont; 77 mph at Erie…and 75 mph at Lafayette. On the 30th…a peak wind gust to 47 mph was recorded at Denver International Airport. .


In 1875…snow fell from the early morning into the early evening. While the amount of snowfall was not recorded… Precipitation from melted snow totaled 0.53 inch. Good sleighing was reported…so snowfall must have been 5 inches or more.

In 1895…northwest winds were sustained to 60 mph in the city.

In 1897…west winds sustained to 52 mph with gusts to 60 mph warmed the temperature to a high of 55 degrees.

In 1912…west winds were sustained to 48 mph with gusts to 52 mph. The Chinook winds warmed the temperature to a high of 50 degrees.

In 1928…snowfall was 0.1 inch in downtown Denver. This was the only measurable snow of the month…ranking the month the third least snowiest on record in the city.

In 1990…strong downslope winds buffeted the eastern foothills. Wind gusts to 91 mph were recorded atop Table Mesa in southwest Boulder…while a gust to 94 mph was clocked at Rollinsville. The high winds caused whiteout conditions due to blowing snow along some highways south and north of Boulder. The high winds downed power lines near the Rocky Flats plant south of Boulder.

In 1998…high winds continued to buffet areas in and near the foothills. Near Evergreen…a 100-foot-high blue spruce crashed down on the roof of a home…splitting the corrugated metal roof in half. Fortunately…the tree… Which measured 10 feet in circumference…only penetrated the home’s interior in a few places. Peak wind reports included: 90 mph at Wondervu…88 mph at the Rocky Flats test facility…83 mph near Conifer…and 82 mph atop Blue Mountain near Coal Creek Canyon. West winds gusted to 39 mph at Denver International Airport.


In 1886…heavy snow totaled 6.5 inches in downtown Denver. Most of the snow…4.5 inches…fell on the 31st. North winds were sustained to 18 mph.

In 1928…snowfall of 0.6 inch was the only measurable snow of the month in the city.

In 1947…post-frontal heavy snow totaled 6.3 inches over downtown Denver. Most of the snow fell on the 30th. North winds were sustained to 17 mph on the 30th.

In 1995…the foothills west of Denver received 5 to 9 inches of new snow…except for Bailey where 11 inches of snow were measured. No snow fell at the site of the former Stapleton International Airport.


In 1890…northeast winds were sustained to 46 mph with gusts as high as 60 mph behind an apparent cold front. A trace of sleet fell.

In 1899…northwest winds were sustained to 44 mph with gusts as high as 48 mph. The Chinook winds warmed the temperature to a high of 49 degrees.

In 1927…the temperature was below zero all day. The high temperature of 3 degrees below zero was a record low maximum for the date. The low temperature was 11 degrees below zero.

In 1970…warm Chinook winds whistled through Boulder. A wind gust to 92 mph was recorded at the National Center for Atmospheric Research…while at the National Bureau of Standards…winds peaked to 70 mph. Northwest winds gusting to 30 mph warmed the temperature to a high of 60 degrees at Stapleton International Airport.

In 1993…occasional high winds occurred northwest of Denver and in the foothills. A wind gust to 85 mph was recorded at Jefferson County Airport in Broomfield. Wind gusts to 86 mph occurred on Squaw Mountain with 75 mph recorded at Rollinsville. West winds gusted to 46 mph at Stapleton International Airport.

In 2011…an intense and fast moving storm system…produced a powerful windstorm across the Front Range. In the mountains and foothills…several locations recorded wind gusts in excess of 100 mph. Numerous trees were knocked down throughout Arapahoe national forest. One man was killed when he was impaled by a falling tree limb while driving along U.S. Highway 36…north of Boulder. The strong winds produced extensive damage to fences and roofs… And also knocked down trees which resulted in power outages that affected 19 thousand residents along the Front Range. In the mountains and foothills…peak wind gusts included: 111 mph…3 miles south-southeast of Pinecliffe; 101 mph…1 mile west of Lyons; 94 mph atop Berthoud Pass; 86 mph…3 miles south of Golden; 84 mph… 4 miles northwest of Boulder; 81 mph in Boulder; 79 mph at Kenosha Pass…NCAR Mesa Lab and the junction of U.S. Highways 72 and 93; 77 mph at the National Wind Technology Center; and 76 mph…3 miles north-northwest of Morrison. Peak wind gusts for the urban corridor included: 80 mph…3 mile east of cedar point; 77 mph in north Longmont; 67 mph…10 miles east of Parker; 64 mph at Buckley AFB and Lakewood; 60 mph at Bennett and Front Range airport in Watkins; 59 mph at Denver International Airport and Deer Trail; 58 mph at Rocky Mountain Regional Airport in Broomfield and 2 miles north-northwest of Louisville.


In 1900…low temperatures dipped to 19 degrees below zero on both days to establish daily record minimum temperatures.

In 1975…only 4.2 inches of snow fell at Stapleton International Airport…while north of Denver a major blizzard raged. All roads north of Denver into Wyoming were closed when strong winds whipped snow into 5 to 6 foot drifts. North winds gusted to 43 mph at Stapleton International Airport on the 31st…causing some blowing snow. Freezing drizzle also fell on the 31st.

In 1984…heavy snow fell in the foothills with 8 inches at Boulder and 6 inches in southern and western metro Denver. Only 1.5 inches of snow fell overnight at Stapleton International Airport.

In 1991…a New Year’s Eve snow storm dumped 2 to 8 inches of snow across northeastern Colorado. Snowfall totaled 3.4 inches at Stapleton International Airport. The 1.9 inches of snow that fell on the 31st was the only measurable snowfall of the month.

In 2008…another brief period of high winds occurred in and near the foothills of Boulder and Jefferson counties. In Nederland…the strong wind snapped a blue spruce which landed on a nearby propane tank. Some roofs in the immediate area were damaged and power lines were downed; which left 126 residences without electricity for six hours. Peak wind gusts included 90 mph at the national wind technology center…and 89 mph; 6 miles northwest of Boulder. At Denver International Airport…a peak wind gust of 23 mph was measured from the southwest.

» Click here to read the rest of December 30 to January 5: This week in Denver weather history

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Cold temperatures to linger through Thornton’s New Year’s Day

Tuesday, January 1st, 2019 5:39am MDT

Our most recent storm system is working its way out. As it does, we will be left with some cloud cover and some very cold temperatures.

A few lingering flurries may be seen early but nothing that is going to amount to much. Any that do pop up should end soon after sunrise. Mostly cloudy skies will start us off then we will see some clearing through the day.

Temperatures start out extremely cold and while we will see some improvement, it will remain much colder than normal.

Tonight, skies will clear and temperatures will once again dip into the single digits.

On the plus side, warmer weather awaits us for the balance of the week with highs in the 50s arriving for the weekend. More in our extended weather forecast here.

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December 2018 top shots: Monthly photo slideshow

Monday, December 31st, 2018 6:55pm MDT
A beautiful sunset over downtown Denver to start the month of December. (Alisa H)

A beautiful sunset over downtown Denver to start the month of December. (Alisa H)

The month of December can offer everything from bone dry conditions to bone chilling cold and monstrous snowstorms.  The weather and wildlife all afford an abundance of photo opportunities as our December photo slideshow shows.

Leaves have fallen from trees now and the landscape can sometimes look quite stark.  However it only takes a quick shot of snow to change that picture greatly.  Throw in gorgeous sunrises and sunsets, plenty of wildlife big and small, kids playing and much more and the month can be quite colorful and eventful.

  • Slideshow updated December 31, 2018
  • 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.

No photos

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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