Thornton, Colorado, USA
UpdatedWed, 22-May-2019 11:40pm MDT 


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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.

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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.

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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.

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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.

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!

April 2019 - Top Shots 2

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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

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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.

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Thornton’s workweek weather to be unsettled, wet and colder

Sunday, April 28th, 2019 4:46pm MDT

Ah yes, springtime in Colorado with the usual swings from warm to storm.  Hopefully you enjoyed this weekend’s mild weather because change is one the way as a series of systems impact us through the middle of the week.

Most notable is the potential for snow tomorrow coupled with significantly colder temperatures. At this time, it looks like the worst of the snow will be confined to the higher altitudes with only light stuff expected here, mainly tomorrow evening.

After a wet start, Tuesday warms up some but remains cooler than normal.

Similar, cool conditions are expected Wednesday with a chance for PM showers.

Thursday starts a warmup that should last through next weekend.

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Thornton’s weekend weather to feature above normal temps, a couple chances for storms

Friday, April 26th, 2019 5:32am MDT

A pretty good looking three day period ahead for us. Temperatures will be above normal with lots of sun with a bit of a chance for some thunderstorms Friday and Sunday.

For today, mostly sunny skies will be above this morning with a bit of an increase in cloud cover later. Friday will be the warmest day of the period with highs in the mid to upper 70s. Late afternoon and evening bring a slight chance for some thunderstorms with gusty winds and high-based showers being the potential threat.

Tonight, any lingering shower activity should end by midnight. Partly cloudy skies will be above with lows in the mid-40s.

Saturday looks to be gorgeous and calm. Highs will be in the low 70s under sunny skies and only a few clouds arriving in the afternoon.

Saturday night into Sunday morning, partly cloudy skies will be above with lows again in the mid-40s.

We close out the weekend on Sunday with another mild day. Highs will be around 70 degrees with mostly sunny skies. The afternoon and evening bring another chance for thunderstorms.

Have a great weekend!

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Temperatures cool to seasonal norms, clouds increase a bit for Thursday

Thursday, April 25th, 2019 4:42am MDT

A cold front moved through last night and that will serve to change our weather a bit. Temperatures will be closer to normal and cloud cover will increase.

The day starts with mostly cloudy skies then we should see some gradual easing of the coverage. By mid-afternoon we should be seeing mostly sunny skies. Temperatures will top out today around 66 degrees, just a couple degrees above normal.

Tonight, partly cloudy skies will be above with lows in the mid-40s.

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April 21 to April 27: This Week in Denver Weather History

Wednesday, April 24th, 2019 1:35pm MDT
This week in Denver weather history

April 21 to April 27: This Week in Denver Weather History

While significant snow events become less frequent this time of year, our look back at this week in Denver weather history shows that they can still occur even toward the end of April. Thrown into the mix is a variety of spring severe weather including tornadoes and deadly lightning.

From the National Weather Service:


In 1984…a large snowstorm buried most of Colorado under a thick mantle of wet snow. Total snow amounts ranged from 10 to 20 inches across metro Denver and a whopping 20 to 40 inches in the adjacent foothills. The snow closed roads and damaged electrical transformers…causing numerous power outages. Nearly 14 inches (13.6) of snow fell at Stapleton International Airport where the combination of snow and wind closed all but one runway…resulting in the cancellation of many flights. Both I-70 and I-76 were closed to the east of Denver.


In 1933…a major storm dumped 16.8 inches of snowfall over downtown Denver when rain changed to snow during the early morning of the 20th and continued through midday of the 22nd. Most of the snow fell on the 21st. Due to melting… The most snow on the ground was 10.5 inches at 6:00 pm on the 21st. Before the snow started…a strong cold front on the evening of the 19th produced north winds sustained to 35 mph with gusts to 37 mph. The strong winds deposited a thin layer of dust on the city. North to northwest winds were sustained to 31 mph with gusts to 35 mph on the 20th and to 29 mph with gusts to 32 mph on the 21st.


In 1957…strong and gusty south to southeast winds raked metro Denver each day. The strongest wind gust of 55 mph occurred on the 21st when blowing dust briefly reduced the visibility to 3/4 mile at Stapleton Airport.


In 1989…unusually warm weather resulted in several daily temperature records being broken in Denver. The high temperature of 89 degrees on the 21st exceeded the record maximum for the month at that time. Daily record high temperatures were either exceeded or equaled with 83 degrees on the 20th…88 degrees on the 22nd…and 85 degrees on the 23rd. The low temperature of 55 degrees on the 22nd equaled the record high minimum for the date.


In 1885…rain changed to snow during the early morning and was the heaviest snow of the season. Total snowfall was estimated at 8.0 inches over downtown Denver…but the snow melted rapidly on the ground as it fell. However… The weight of the snow…as well as northwest winds sustained to 29 mph downed telegraph and telephone wires. Several large branches of trees were also broken by the weight of the snow. Precipitation totaled 1.01 inches from the storm.

In 1887…west winds were sustained to 47 mph.

In 1932…the temperature dipped to a low of only 60 degrees… The all-time record high minimum for the month.

In 1988…a small tornado was observed by National Weather Service employees about 3 miles northwest of Thornton. It was on the ground for about 2 minutes. No damage was reported. Later…lightning struck two 14-year-old girls on a softball field in Westminster. One was killed…while the other suffered moderate injuries. Northwest winds gusted to 44 mph at Stapleton International Airport behind a cold front.

In 2010…severe thunderstorms produced large hail…strong winds and a tornado across parts of Adams…Arapahoe… Elbert…and weld counties. The hail…up to 1.50 inches in diameter…came down so heavy along parts of I-70 and I-76 that snowplows had to be called out to remove it. Numerous vehicles were damaged by hail. In weld County…very heavy rain and hail accompanied thunderstorm winds up to 75 mph. Hail up to 1.50 inches was reported near Bennett; 1.25 inches…5.3 miles east of Englewood; 1.0 inch size hail near Buckley Field; with 0.88 inch size hail near Boulder. A weak tornado touched down briefly in Elbert County…about 9 miles southwest of Deer Trail…but did no damage. Several minor accidents were reported with snowpacked and slick road conditions along with very low visibilities. Minor street flooding was reported in southeast Aurora. Denver International Airport recorded 0.30 inches of rainfall. Also…a peak wind gust to 36 mph from the southeast was observed at the airport.


In 1910…north winds were sustained to 45 mph behind a cold front. Rainfall totaled 0.63 inch.

In 1923…snowfall of 2.0 inches in the city was the only snow of the month and the last measurable snow of the season. Northwest winds were sustained to 25 mph on the 21st.

In 1952…heavy snowfall totaled 7.6 inches at Stapleton Airport. The storm was accompanied by north winds gusting to 33 mph.

In 2001…the second major snow storm in 11 days moved into metro Denver with blizzard conditions developing again across the plains to the northeast of Denver. Snowfall amounts ranged up to 9 inches in metro Denver with up to 23 inches in the foothills. Northwest winds were sustained at 20 to 30 mph with gusts as high as 36 mph at Denver International Airport which was again shut down for nearly an hour by power outages on the 22nd. The outages affected lighting in the concourses…train operations…de-icing and refueling operations…flight information displays…and security screenings. Navigational aids were also affected… Resulting in the cancellation of 58 arriving and departing flights which stranded about 5000 passengers. Across metro Denver storm totals included: 9 inches at Eldorado Springs; 7 inches in Boulder; 6 inches at Ken Caryl…Northglenn and near Sedalia; and 5 inches in Arvada and Morrison. Only 1.7 inches of snow were measured at the site of the former Stapleton International Airport. In the foothills snow totals included: 23 inches near Fritz Peak south of Rollinsville…17 inches near Jamestown…16 inches near Blackhawk…14 inches in Coal Creek Canyon…13 inches at Idaho Springs and near Nederland…11 inches at Aspen Springs…and 10 inches near Bergen Park.


In 1999…a spring snowstorm dumped heavy snowfall over metro Denver and in the foothills. Nearly 3 feet of snow fell in the foothills with over a foot in the city. The heavy wet snow downed power lines in Douglas and Elbert counties. Scattered outages were reported at Parker…Franktown… Sedalia…and Castle Rock. Some residents were without electricity for as long as 20 hours. The inclement weather was blamed…at least in part…for several traffic accidents along the I-25 corridor between Denver and Castle Rock. Snowfall totals included: 32 inches at Idaho Springs; 31 inches on Crow Hill; 29 inches near Evergreen; 26 inches at Chief Hosa and Coal Creek Canyon; 25 inches at Bailey; 24 inches at Floyd Hill; 23 inches at Conifer…Genesee…Golden Gate Canyon…North Turkey Creek…and Pine Junction; 13 inches at Broomfield and near Sedalia; 12 inches in Boulder; 11 inches at Louisville and Parker; and 9 inches at the site of the former Stapleton International Airport.

In 2004…heavy snow fell across metro Denver…when low level upslope conditions developed against the foothills and Palmer Divide. Snowfall totals included: 18 inches in the foothills southwest of Boulder…17 inches at Intercanyon and near Conifer…10 inches near Blackhawk and Parker…9 inches at Castle Rock and near Sedalia…7 inches in centennial… Littleton…and near lone tree. Elsewhere across metro Denver…snowfall generally ranged from 2 to 5 inches. Snowfall was 4.7 inches at Denver Stapleton. Northwest winds gusted to 35 mph at Denver International Airport on the 21st.

» Click here to read the rest of April 21 to April 27: This Week in Denver Weather History

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