Thornton, Colorado, USA
UpdatedSun, 15-Sep-2019 7:00pm MDT 


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

Cooler temperatures, chance for thunderstorms start Thornton’s workweek

Monday, May 6th, 2019 4:59am MDT

The first of a series of systems that will be impacting our weather through the week arrives today. With it, temperatures cool to around normal and we see a bit of chance for a thunderstorm.

Cloudy skies start things off then we will see some improvement later in the morning. Clouds will then increase again in the afternoon.

Temperatures will head toward a high in the mid-60s, near the average for the date of 66 degrees.

Some scattered thunderstorms will develop this afternoon with our best chance coming in the late afternoon and evening from about 5:00pm to 8:00pm.

Light rain showers with a bit of thunder will be possible till midnight then we see just some light rain after that. Overnight lows tonight will dip to the mid-40s.

Keep an eye out for the showers with our interactive radar here.

Join the Discussion - Post your commentJoin the Discussion!

April 2019 weather recap: Warmer, drier than normal for Thornton

Sunday, May 5th, 2019 6:43am MDT

The month of April had the usual, inconsistent weather conditions we expect from the month. Thornton enjoyed everything from spring-like days with mild temperatures to a healthy round of snow and cold.

The month started out mild with seven of the first nine days of the month seeing above normal temperatures and pleasant conditions. A cold front and storm system moved in on the 10th though and brought about significant changes for a few days and our first snow of the month.

Warmer weather returned though and on the 20th we recorded our first 80 degree day of the year. Showers and thunderstorms on the 21st brought some much-needed rain then we dried back out for the next six days. We saw a couple more 80+ degree days then the final two days chilled things out and delivered a bit more snow.

Thornton’s overall average temperature for the month came in at 49.6 degrees. This was a good bit above Denver’s long-term April average of 47.4 degrees. Out at DIA where the Mile High City’s official measurements are kept, the average temperature was similar with 49.1 degrees.

Temperatures in Thornton ranged from a high of 81.4 degrees on the 26th down to a low of 17.5 degrees on the 11th. Denver saw a high reading of 80 degrees on the 20th and a low of 17 on the 11th.

In terms of precipitation, Denver averages 1.71 inches during April. Both Thornton and Denver fell short of that mark with 0.78 inches and 1.25 inches in their rain buckets respectively.

Snowfall in Thornton was respectable with 8.1 inches of the white stuff. Denver was well short of that with 3.5 inches. April averages 6.8 inches so while Thornton was above that, Denver was below.

Click here to view Thornton’s April 2019 climate report.

Thornton, Colorado's April 2019 temperature summary. (ThorntonWeather.com)

Thornton, Colorado’s April 2019 temperature summary. (ThorntonWeather.com)

Thornton, Colorado's April 2019 precipitation summary. (ThorntonWeather.com)

Thornton, Colorado’s April 2019 precipitation summary. (ThorntonWeather.com)

913 AM MDT WED MAY 1 2019




                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
 HIGH              90   04/30/1992
 LOW               -2   04/02/1975
HIGHEST            80   04/20                         83  04/29
LOWEST             17   04/11                         21  04/06
AVG. MAXIMUM     62.7              61.5     1.2     63.2
AVG. MINIMUM     35.6              33.3     2.3     32.5
MEAN             49.1              47.4     1.7     47.8
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.3    -0.3        0
DAYS MIN <= 32     10              13.0    -3.0       16
DAYS MIN <= 0       0               0.0     0.0        0

 MAXIMUM         8.24   1900
 MINIMUM         0.03   1963
TOTALS           1.25              1.71   -0.46     0.86
DAILY AVG.       0.04              0.06   -0.02     0.03
DAYS >= .01         9               9.1    -0.1        8
DAYS >= .10         2               4.5    -2.5        4
DAYS >= .50         1               0.9     0.1        0
DAYS >= 1.00        0               0.5    -0.5        0
 24 HR. TOTAL    0.82   04/21 TO 04/21           04/21 TO 04/21

 TOTAL            3.5               6.8
RECORD APRIL     33.8    1933

HEATING TOTAL     469               529     -60      509
 SINCE 7/1       5805              5731      74     5250
COOLING TOTAL       0                 1      -1        2
 SINCE 1/1          0                 1      -1        2

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

AVERAGE WIND SPEED              10.3

AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC             19


Join the Discussion - Post your commentJoin the Discussion!

First weekend of May to bring calm, mild weather conditions to Thornton

Friday, May 3rd, 2019 5:00am MDT

We are set to enjoy a very nice, spring weekend. Expect to see a good bit of sun and temperatures at or above normal.

Friday will be the coolest of the three days with highs right near normal. Look for sunny skies overall with only a few late day clouds. Tonight, mostly clear skies will be above with lows around 40 degrees.

Saturday warms up further with highs around 70 degrees under mostly sunny skies. Saturday night into Sunday, clouds will increase a bit with lows in the low to mid-40s.

Sunday will be the warmest day of the period with highs in the mid-70s. Mostly sunny skies will be above.

Have a great weekend!

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s May weather preview: Snow begins to give way to severe storms

Thursday, May 2nd, 2019 4:19pm MDT
Thornton, Colorado May 2013 weather preview.

Thornton, Colorado May 2013 weather preview.

Colorado’s famously highly variable weather seems to showcase itself during the month of May when a variety of weather conditions can be seen.

Winter-like temperatures and snow are possible as are mid-summer like temperatures or the more typical spring severe weather.

As the month starts out in 2019 we are going to wear off the chill of recent days and warm up nicely but cooler and wetter weather appear to be on the way.  Long range forecasts predict we may be seeing cooler than normal temperatures with above normal precipitation for the month.

The month can certainly bring extremes.  Snow is not entirely uncommon during the month, oftentimes causing damage to newly bloomed trees.  More common however is severe weather, particularly in the latter half of the month.  Thunderstorms become more frequent and their associated hazards – lightning, wind, hail and tornadoes – are usual visitors.

For a complete look at what lies ahead for the month of May, check out our full preview here.

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s Thursday to see a return of the sun, warmer temperatures

Thursday, May 2nd, 2019 6:11am MDT

Today we begin to shake off the chill of recent days. The sun will make an appearance and temperatures, while remaining below normal, will warm up a good bit.

Partly sunny skies start us off then we should see some additional clearing for mid-day before a few more clouds return of the late afternoon. Highs today will top out at around the 60 mark, about 6 degrees below normal.

Tonight, partly clear skies will be above with lows in the mid to upper 30s.

Warmer weather lies ahead for Friday and the weekend. See the extended forecast here.

Join the Discussion - Post your commentJoin the Discussion!

Wednesday weather to offer cool temperatures, some showers

Wednesday, May 1st, 2019 5:00am MDT

We’ll kick off the month of May somewhat like how we closed out April. Temperatures today will be well below normal and we will see some light, scattered showers throughout the day.

Cloudy to mostly cloudy skies start us off with a good bit of cloud cover lasting through the day. Highs will top out in the low 50s with winds out of the north.

Light showers will be possible throughout the day with the best chance coming this afternoon. Activity should be scattered.

Tonight, showers will linger until midnight, perhaps with a bit of snow mixed in after dark but no accumulation.  Overnight lows will be near the freezing mark.

Warmer, drier weather lies ahead starting tomorrow and lasting through the coming weekend.

Join the Discussion - Post your commentJoin the Discussion!

Thornton closes out the month of April with a cool, damp day

Tuesday, April 30th, 2019 5:46am MDT

Mother Nature seems to want to remind us that while the calendar says it is spring, we can still get those doses of winter-like weather. Such was the case with last night’s snow and today, while we see some improvement, temps will be well below normal.

The day starts off with cloudy skies. Some easing of the cloud cover will occur during the day but not much. Highs today will be topping out in the low 50s, about 15 degrees below normal. Some light showers will be possible throughout the day but we aren’t expecting much out of them.

Tonight, some lingering showers will be around with cloudy skies and lows in the mid-30s.

Join the Discussion - Post your commentJoin the Discussion!

April 2019 top shots: Monthly photo slideshow

Monday, April 29th, 2019 7:34pm MDT
April 7, 2019 - A stunning sunset in Thornton to end the day. (Michelle Jones)

April 7, 2019 – A stunning sunset in Thornton to end the day. (Michelle Jones)

April can be a tricky month weather-wise with everything from mild temperatures to snow to severe weather being possible.  The good thing about that is that it provides plenty of chances for great photos!

April marks a transition between winter and summer for most of the country but for Denver it is especially true as we can see a stunning variety of weather.

The proverbial April showers are certainly a possibility for Denver. Snow? Tornadoes? Thunderstorms? You bet – all can happen!

Throw in our usual wildlife plus the wide variety of birds that return to the Centennial State for the spring and summer and there is a lot going on.

  • Slideshow updated April 29, 2019. 
  • 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!

April 2019 - Top Shots 2

Join the Discussion - Post your commentJoin the Discussion!

April 28 to May 4: This Week in Denver Weather History

Monday, April 29th, 2019 6:00am MDT
This week in Denver weather history

April 28 to May 4: This Week in Denver Weather History

As we begin to enter the month of May, Denver’s weather starts to make the move toward spring severe weather and snow becomes less common. Looking back at this week in Denver weather history, there has been some snow but lightning and hail are more typical of the types of extreme weather we would expect to see.

From the National Weather Service:


In 1919…rainfall totaled 2.03 inches for the two days… Along with a trace of snowfall. Northwest winds were sustained to 24 mph with gusts to 26 mph on the 27th.

In 1975…high winds gusting to 85 mph severely damaged a mobile home in Boulder and caused other minor damage. West winds gusted to 46 mph at Stapleton International Airport on the 28th.

In 1996…heavy snow fell over portions of the Front Range foothills west of Denver. Snowfall amounts ranged from 4 to 7 inches. Only 0.3 inch of snow fell at the site of the former Stapleton International Airport. North winds gusted to 41 mph at Denver International Airport on the 27th.


In 1894…southwest winds were sustained to 35 mph with gusts as high as 60 mph.

In 1896…apparent post-frontal bora winds from the northwest were sustained to 43 mph with gusts as high as 56 mph. Rainfall totaled 0.22 inch.

In 1990…high winds raked the northeastern plains and eastern foothills from Boulder north. Wind gusts to 70 mph were recorded in Boulder. West winds gusted to 41 mph at Stapleton International Airport.

In 2001…a 21-year-old man was struck by lightning along the shoulder of I-225 near Parker road. His brother’s car had broken down and he stopped to help. The bolt briefly stopped the man’s heart and caused the right side of his body to go numb.

In 2003…severe thunderstorms produced large hail across southern metro Denver. Hail to 1 3/4 inches in diameter fell in Englewood and 2 miles east of Centennial Airport. Hail as large as 1 1/2 inches in diameter fell in Aurora near Cherry Creek. Other large hail reports included 1 inch hail near Bennett…and 7/8 inch hail in greenwood village and at centennial airport.


In 1950…snowfall totaled 6.3 inches at Stapleton Airport…but only 3.5 inches over downtown Denver.

In 1960…heavy snow fell at Stapleton Airport where 8.6 inches of snow were measured. North winds gusted to 38 mph. Most of the snow…6.9 inches…fell on the 29th.

In 2017…a late spring storm brought heavy snow to areas in and near the Front Range Foothills and Palmer Divide. Storm totals included: 25 inches near Genesee…19 inches at Evergreen…18 inches near Nederland…16.5 inches near Idledale…16 inches near Pinecliffe…15 inches at Kittredge…14 inches at Ken Caryl and near Roxborough State Park…12.5 inches near Elizabeth…12 inches in Eldorado Springs…11 inches near Brookvale and 12 miles northwest of Golden…with 10.5 inches at Lone Tree. Heavier snow occurred over the western and southern suburbs of Denver. Storm totals included: 10 inches in Littleton…8 inches at Centennial…3 miles southeast of Denver and near Greenwood Village…7 inches near Wheat Ridge…6 inches in Arvada and Castle Pines…with 5 inches in Boulder. Across the northern part of Denver…lesser amounts of 1 to 4 inches were reported. At Denver International Airport…2.4 inches of snowfall was observed.


In 1898…apparent thunderstorm winds were sustained from the southwest to 58 mph with gusts to 66 mph.

In 1909…north winds were sustained to 44 mph behind an apparent cold front. These were the strongest measured winds of the month that year.

In 1962…heavy snowfall totaled 6.4 inches at Stapleton Airport where northeast winds gusted to only 17 mph. Snow fell all day…but the most on the ground was only 1 inch due to melting.

In 1991…two men were struck by lightning while golfing in Cherry Hills just south of Denver. The two received only minor burns. Shortly afterward…lightning struck a home in cherry hills village several times…leaving numerous holes in the roof. No injuries were reported.

In 1993…localized strong winds occurred at Jefferson County Airport near Broomfield where gusts to 63 mph were recorded. The strong winds were the result of a probable microburst.

In 2000…several severe thunderstorms producing large hail and destructive winds rumbled across northern metro Denver. Thunderstorm wind gusts reached 81 mph near Hudson with hail as large as 3/4 inch in diameter at Longmont. Several homes and vehicles sustained damage. The strong winds uprooted trees and downed utility poles…causing scattered outages. Lightning sparked a house fire in Boulder. The fire damaged a portion of the roof and a bedroom on the third floor. Thunderstorm winds gusted to 53 mph at Denver International Airport.

In 2003…lightning struck a chimney at a residence in Hiwan in Evergreen…sending stones flying as far as 150 feet. Electrical equipment in some nearby homes also failed. Damage to the residence…in addition to electrical equipment…was estimated at 100 thousand dollars. Severe thunderstorms produced large hail to 1 inch in diameter near Hudson and Sedalia and to 3/4 inch near Parker. Hail as large as 1 3/4 inches was measured 9 miles north of Sedalia.

In 2014…high winds occured east of Interstate 25. Peak wind gusts included: 71 mph just north of Strasburg; 68 mph at Denver International Airport; 62 mph near Elizabeth; 58 mph at Front Range Airport in Watkins and 11 miles east of Parker.


In 1964…several weeks of dry weather and windy conditions across the Great Plains to the east caused noticeable suspended dust to invade metro Denver. At Stapleton International Airport east winds gusted to 28 mph and visibility was reduced to 5 miles.

In 1989…a late season snowstorm dropped 2 to 4 inches of snow across metro Denver with 6 to 12 inches in the foothills. Snowfall totaled 3.9 inches at Stapleton International Airport where northeast winds gusted to 23 mph and the greatest snow depth on the ground was 2 inches due to melting.

In 1991…a pacific storm dumped heavy wet snow across metro Denver. The foothills were hit the hardest where snowfall amounts ranged from 16 inches at Evergreen to 5 inches at Idaho Springs. Lower elevations of metro Denver received 5 to 9 inches of snowfall with 5 inches in Boulder and 7.0 inches at Stapleton International Airport where northeast winds gusted to 25 mph. The weight of the snow caused power lines to fall and tree limbs to snap…producing power outages in parts of Denver…Aurora…and Westminster.

In 1999…heavy snow fell overnight in the foothills above 7500 feet elevation. Snowfall totals included: 13 inches near Rollinsville…10 inches near Evergreen…8 inches at Blackhawk and Nederland…and 7 inches at Conifer. Only rain fell across the city with 2.13 inches recorded at Denver International Airport.


In 1954…a major storm dumped 10.1 inches of snowfall at Stapleton Airport. Most of the snow…7.5 inches…fell on the 29th and 30th. The maximum snow depth on the ground was 5 inches on the 30th due to melting. No strong winds accompanied the storm.


In 1896…northwest winds were sustained to 55 mph with gusts as high as 64 mph in the city.

In 1960…the minimum temperature dipped to 22 degrees at Stapleton Airport. The sub-freezing cold damaged fruit trees and some other crops in the area.

In 1967…west winds gusted to 51 mph at Stapleton International Airport. Winds were strong and gusty across all of metro Denver.

In 1972…hail 1/2 to 3/4 inches in diameter fell at Stapleton International Airport. Northwest winds gusted to 35 mph.

In 1980…a cold air funnel touched down several times near Louisville.

In 1983…mothball-size hail fell in Wheat Ridge.

In 1992…the all-time highest recorded temperature in April… 90 degrees…occurred. This is also the earliest 90 degree reading for the season.

In addition…the temperature dipped to a low of only 56 degrees…setting a record high minimum for the date.

In 1995…hail…up to 3/4 inch in diameter…fell at Denver International Airport. The hail was soft…lasted for only 8 to 10 minutes…and caused no damage.

In 2002…drought conditions started to have an effect on greater metro Denver. April…normally the third snowiest month of the year in Denver averaging just over 9 inches of snow…ended with only a trace of snow…ranking the month… Along with previous Aprils…the 2nd least snowiest on record. The month ended with only 0.23 inch of liquid precipitation making the month the 3rd driest on record. Mountain snowpack was less than half of normal for this time of year. A statewide drought emergency was declared by the governor.

In 2003…a small tornado touched down 10 miles east of Hudson… But did no damage. Hail as large as 3/4 inch in diameter fell in Aurora near Cherry Creek.

In 2004…post-frontal upslope flow produced light snowfall across metro Denver. Snowfall was 4.0 inches at Denver Stapleton…while the temperature hovered in the lower 30’s all day. The high temperature was only 33 degrees…a record low maximum for the date. The low temperature of 30 degrees was not a record. North winds gusted to 20 mph at Denver International Airport.

» Click here to read the rest of April 28 to May 4: This Week in Denver Weather History

Join the Discussion - Post your commentJoin the Discussion!

Storm system arrives to kick off Thornton’s workweek with wet, cold conditions

Monday, April 29th, 2019 5:52am MDT

Quite a stark contrast in the weather today versus what we experienced over the weekend. Today, temperatures will be 40+ degrees colder and we stand a decent chance to see some snow.

The day starts with mostly cloudy skies and we won’t be seeing much sun, if any, through the day. Temperatures will top out in the mid to upper 30s.

We do expect to see a good dose of precipitation, starting off scattered after 10:00am and increasing in chances this afternoon and particularly overnight. What form that precipitation comes as is going to be greatly dependent on temperatures. A rain / snow mix is most likely, particularly initially.

Tonight, if temperatures get cold enough, it could change to all snow. Right now we’re thinking a half inch to two inches on the grass before sunrise tomorrow AM.

Warmer temps though would mean all rain, colder temps more snow.

Join the Discussion - Post your commentJoin the Discussion!