Thornton, Colorado, USA
UpdatedSun, 18-Nov-2018 5:05am MST 


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Tuesday again brings on the heat, just a slight chance for a thunderstorm

Tuesday, June 5th, 2018 5:03am MST

The second in a string of what will likely be 90+ degree days that is going to stretch into next week. We do see the slightest chance for a PM thunderstorm today as well.

The day starts out under sunny skies then just a few clouds for the rest of the morning. This afternoon will bring an increase in coverage as upper level moisture increases. That moisture may allow a quick sprinkle of rain and a gusty thunderstorm in the mid to late afternoon but the chances are not particularly good. Temperatures today will push close to the record high for the date of 95 degrees.

Tonight, skies will be partly cloudy with lows in the upper 50s.

You can keep an eye on the rising mercury here.

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Thornton’s Monday kicks off a workweek of unseasonably warm temperatures

Monday, June 4th, 2018 4:57am MST

Typically this time of year we expect to see highs in the upper 70s. Mother Nature has other plans though as the week will see temperatures topping out 10+ degrees above normal.

For today, we start out with sunny skies that will be with us through the morning then maybe just a few clouds in the afternoon and evening. Winds will be relatively light and out of the north.

As for those temperatures, after a comfortable start, the mercury will climb quickly as we head toward a high in the low 90s.

Tonight, skies remain mostly clear with lows in the mid to upper 50s.

As for the rest of the week, we will see highs in the low to mid-90s throughout the period, just slight chances for thunderstorms on a couple of the days.

Stay cool out there!

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Thornton’s June weather preview: Severe weather, hotter temps the general rule

Thursday, May 31st, 2018 3:39pm MST

Thornton's June weather preview.Extreme weather can occur during in month in Colorado we well know.  June however is when traditional spring severe weather arrives in the state oftentimes with hail, damaging wind and tornadoes.

Over 40 percent of the tornadoes that occur in Colorado happen during the month of June.  Far more common are thunderstorms with hail and wind, each responsible for extensive damage each year.

While severe weather is common, so too are brilliantly sunny and mild days as we close out spring and enter summer.  If you are looking for cold, it isn’t likely but it is possible as the Denver area has seen freezing temperatures and yes, even snow, during the month.

Read more about Thornton and Denver’s June weather and a look ahead at this year.

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May 27 to June 2: This Week in Denver Weather History

Thursday, May 31st, 2018 2:56pm MST
This week in Denver weather history

May 27 to June 2: This Week in Denver Weather History

A very eventful week in Denver weather history with everything from thunderstorms and tornadoes to yes, even snow.

From the National Weather Service:


In 2002…lightning sparked a wildfire near Deckers. Extremely dry conditions and very strong winds the following day allowed the fire…known as the Schoonover…to consume 3850 acres before it could be contained. Thirteen structures were destroyed…including 4 homes…resulting in 2.2 million dollars in damage.


In 1995…a cool period with light morning showers and moderate to heavy afternoon showers and thunderstorms pushed rivers already swollen from mountain snow melt over their banks causing minor flooding. Streams and rivers such as the South Platte and Boulder Creek flooded meadowlands…bike paths…roads near streams…and other low lying areas. No significant property damage was reported and crop damage was unknown. Rainfall totaled 1.79 inches at the site of the former Stapleton International Airport and only 1.51 inches at Denver International Airport.


In 1874…an apparent thunderstorm gust front reached the city at 6:40 pm. Strong southwest winds sustained to 48 mph for a few minutes produced large columns of dust in the city and on the prairie. There was no rain in the city.

In 1942…a duststorm swept into the city…but no damage was reported. West winds were sustained to 23 mph.

In 1953…a heavy hailstorm caused an estimated 100 thousand dollars damage across metro Denver. Larger than golf ball size hail fell in Westminster and north Denver. Only 1/8 inch hail was measured at Stapleton Airport.

In 1955…west-northwest winds at 35 mph with gusts as high as 58 mph briefly reduced the visibility to 1/2 mile in blowing dust at Stapleton Airport.

In 1981…lightning damaged power lines west of Lakewood and blew up a transformer at the Denver Federal Center. Hail 1 to 1 1/2 inches in diameter was reported in Lakewood and on I-25 south of Denver.

In 2001…hail as large as 3/4 inch in diameter was measured near Commerce City.

In 2003…hail to 3/4 inch in diameter fell near Central City.

In 2006…unusually warm weather for late May produced two temperature records. The high temperature of 93 degrees was a record maximum for the date. The low temperature of 59 degrees equaled the record high minimum temperature for the date. Both previous records occurred in 1895.


In 1884…a thunderstorm apparently produced large hail. The hail stones were noted as unusually large…but the diameter of the stones was not measured. The hail fell for only 5 minutes. Precipitation from the storm was only 0.05 inch.

In 1898…heavy thunderstorm rainfall totaled 1.74 inches in downtown Denver. Hail of unknown size accompanied the storm.

In 1981…a woman in Aurora was struck and killed by lightning. Another bolt injured a boy on a bicycle at about the same time a short distance away. About half an inch of rain in 20 minutes caused street flooding in the area. A tornado touched down for about 2 minutes some 3 miles north of Stapleton International Airport.

In 1982…severe thunderstorms produced golf ball size hail in southeast Denver…Aurora…and Strasburg. The large hailstones undoubtedly damaged some cars in the area. At Stapleton International Airport…only 1/2 inch diameter hail was measured.

In 1991…golf ball size hail fell in Brighton. No damage was reported. Later…hail ranging in size from 3/4 inch to 1 1/2 inches in diameter fell over southwestern sections of metro Denver. In some areas…hail piled up a few inches in depth.

In 1994…thunderstorm wind gusts to 65 mph damaged 16 small airplanes and a hangar at centennial airport.

In 2001…severe thunderstorms produced large hail across metro Denver. Hail as large as 1 inch in diameter fell in Lakewood…Wheat Ridge…northwest Denver…near Watkins… Bennett…and Keenesburg. Hail 3/4 inch or larger fell in Brighton. Thunderstorm winds gusted to 58 mph at Denver International Airport. A small tornado (f0) touched down near Bennett…but did no damage.


In 1934…the low temperature dipped to only 66 degrees…the all-time record highest minimum temperature for the month of May.

In 1958…a microburst caused a brief wind gust to 56 mph at Stapleton Airport.

In 1964…heavy rain caused flooding in the Harvey Gulch area of southeast Denver. The high water damaged homes… Businesses…streets…and bridges. At Stapleton International Airport…1.33 inches of rain were measured with 1.76 inches total rainfall on the 29th and 30th. The heavy rain during the last week of the month was the first significant precipitation since April 3rd.

In 1967…3/4 to 1 inch diameter hail stones fell in the city of Denver…but caused no reported damage. Hail as large as 3/4 inch was measured at Stapleton International Airport.

In 1975…the heaviest last snowfall of the season occurred when 5.6 inches of snow were measured at Stapleton International Airport. Rain all day on the 28th changed to snow on the 29th and accumulated to a depth of 4 inches on the ground. Northwest winds gusted to 31 mph. Precipitation (rain and melted snow) on the 28th and 29th totaled 1.48 inches.

In 1982…one man was killed and two others injured by a lightning strike as they stood under a tree in the city of Denver’s Washington Park.

In 1987…7/8 inch diameter hail fell near Castle Rock.

In 1990…thunderstorms over metro Denver produced several small funnel clouds and two small tornadoes. The first tornado (f0) touched down in northwest Denver and caused roof damage to a house and snapped off the tops of several trees. A second tornado (f1) touched down in Northglenn and moved into Thornton damaging a group of self storage garages…several vehicles…a wooden fence…several trees… And the roof of an auto parts store. No injuries were reported. The storms also caused minor street flooding across northern and western sections of metro Denver. Rainfall totals ranged from 1 to 3 inches. Lightning started a small fire at a home in northwest Denver. The fire was confined to the front rooms and was quickly extinguished. Snow plows were used to clear 2 to 4 inches of pea to marble size hail from a stretch of U.S. Highway 285 in turkey creek canyon. Lightning felled a tree in northeast Denver…while strong winds snapped off several large tree limbs in the same area. Thunderstorm rainfall totaled 0.82 inch at Stapleton International Airport where southwest winds gusted to 30 mph.

In 1991…lightning struck a 13 year old boy in a field in Fort Lupton. The boy was in critical condition in an area hospital for 2 days before recovering.

In 1995…lightning struck a soccer goal post and injured 6 adults viewing a soccer game in Arvada. Although no one received a direct hit from the lightning…all escaped with only minor injuries…except one woman who was hospitalized.

In 1996…large hail…3/4 to 1 1/2 inches in diameter… Struck Lakewood and west Denver. Lightning sparked a small fire when it struck an oil storage tank 5 miles west of Brighton.

In 2001…lightning sparked a fire in an apartment complex in Aurora…forcing the evacuation of 24 units. Most of the fire damage was confined to the attic. Damage was estimated at 100 thousand dollars.

In 2004…a man and his son were struck by lightning while practicing on the driving range at the meadows golf club in southwest metro Denver. The father was killed by the bolt…and his 16 year old son seriously injured. Three other people standing nearby received only minor injuries.

In 2010…hail up to 7/8 inch in diameter was reported in Broomfield.

In 2017…an isolated thunderstorm produced hail up to 7/8 inch in diameter near Centennial.

» Click here to read the rest of May 27 to June 2: This Week in Denver Weather History

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May 2018 top shots: Monthly photo slideshow

Thursday, May 31st, 2018 4:53am MST
May 3, 2018 - A gorgeous spring day in the north Denver metro area. (Lori Golden)

May 3, 2018 – A gorgeous spring day in the north Denver metro area. (Lori Golden)

Colorado’s famously highly variable weather seems to showcase itself during the month of May when a variety of weather conditions can be seen.  This provides a prime opportunity for photos of everything weather to flora to fauna.

The month of May can bring extremes.  Snow is not entirely uncommon during the month but more common 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.  Providing additional subjects for pictures are the emerging spring flowers and our abundant wildlife.

  • Slideshow updated May 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.

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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Thornton’s Memorial Day weekend to be dominated by hot temps, then cooler at the end

Friday, May 25th, 2018 4:59am MST

High pressure is going to reign over the area for most of the holiday weekend leading to unseasonably warm temperatures and dry conditions. It will close out though with cooler temps and perhaps some showers.

Friday brings conditions much like the last couple of days. Sunny skies will be above and highs in the upper 80s, perhaps our first 90 degree reading of the season. Skies stay mostly clear tonight with lows in the mid-50s.

Saturday will bring the hottest day of the period with highs in the low to mid-90s. Lots of sun will be above with some breezy afternoon winds. Saturday night into Sunday morning look for mostly cloudy skies and lows in the mid-50s.

Sunday continues the hot weather with highs in the low 90s under mostly sunny skies. Sunday night temperatures again will be in the mid-50s under partly cloudy skies.

Things finally cool down on Monday. Highs will be around the 80 degree mark and we should have a decent chance for some afternoon showers and thunderstorms.

Have a great weekend!

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Unseasonably warm temperatures, dry conditions for Thornton’s Thursday

Thursday, May 24th, 2018 5:38am MST

A day much like the last couple but without the chance for thunderstorms and temperatures a touch warmer.

We start out under sunny skies today then the afternoon brings a few clouds into the mix. However, with little moisture to work with, we don’t expect to see any storms in our area. Temperatures are going to climb today heading toward a high in the mid-80s.

Tonight, skies remain partly clear with lows around 53 degrees.

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Wednesday brings unseasonably warm temperatures, slight chance for storms

Wednesday, May 23rd, 2018 5:03am MST

Thornton’s weather today looks a good bit like yesterday. Temperatures will again be warmer than normal and we see another chance for late afternoon thunderstorms.

We start out under sunny skies and while we may see a few clouds, particularly in the afternoon, they won’t be too intrusive. Temperatures will warm steadily this morning and head toward an afternoon high of around 83 degrees, almost 10 degrees above normal.

Late afternoon into evening brings us another chance for a few thunderstorms to move through. However, the air is looking to be a bit drier so chances are decreased.

Tonight, partly clear skies will be above with lows in the low to mid-50s.

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Above normal temperatures, slight chance for PM thunderstorms Tuesday

Tuesday, May 22nd, 2018 4:58am MST

A relatively normal day of weather for Thornton for the time of year. Temperatures will be mild, a good bit above normal, and we stand a slight chance for an afternoon and evening thunderstorm.

The day starts with mostly sunny skies and they will stick with us this morning then we see a bit of an increase in cloud cover in the afternoon. Highs will top out right near the 80 degree mark. The afternoon may bring a few scattered thunderstorms to the area.

Tonight, after any evening storms clear out, mostly clear skies will be above. Lows tonight will be in the low to mid-50s.

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Thornton’s workweek starts with a largely seasonal day, typical chance for storms

Monday, May 21st, 2018 5:02am MST

The cool, damp weather of the past weekend has moved out and this week we see drier, warmer conditions. Today starts things off with temps a bit above normal and the standard chance of thunderstorms we expect this time of year.

The day starts out mostly clear with a few spots of patchy fog. Mostly sunny skies will be with us this morning then a bit of an increase in cloud cover in the afternoon. After sunrise, temperatures will rise steadily toward high in the upper 70s. There will be a slight chance for some isolated thunderstorm activity from about 2:00pm through much of the evening.

Tonight, partly clear skies will be above with lows to the low 50s.

For a look at the rest of the week, see the extended weather forecast here.

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