Thornton, Colorado, USA
UpdatedThu, 20-Sep-2018 5:10am MDT 


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Thornton’s weekend to feature calm and mild weather conditions

Friday, May 4th, 2018 5:43am MDT

Following three days of wet, unsettled weather, we now put together three days of mild, dry and calm conditions. The weekend will be a very nice one with only a slight chance for thunderstorms late in the period.

For Friday, sunny skies will be the rule with only a few clouds in the evening. Winds will be light, conditions calm. Highs today will top out right around the 70 degree mark. Tonight, skies remain mostly clear with lows in the mid-40s.

Saturday will be the warmest day of the three days with highs in the upper 70s. We will have a few clouds but nothing that should be too intrusive. Saturday night into Sunday morning, skies will be partly clear with lows in the mid to upper 40s.

The pleasant weather continues on Sunday. Mostly sunny skies will be above with highs in the low to mid-70s. There will be a slight chance for an evening thunderstorm.

Have a fantastic weekend and enjoy that weather!

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April 29 to May 5: This week in Denver weather history

Thursday, May 3rd, 2018 5:00am MDT
This week in Denver weather history

April 29 to May 5: This week in Denver weather history

May can bring a variety of conditions from snow and cold to severe thunderstorms and flooding rains. Looking back at this week in Denver weather history we see where all of those events have made an appearance in our past.

From the National Weather Service:


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 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 occurred 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 29 to May 5: This week in Denver weather history

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Cool and wet conditions for Thornton’s Thursday, clouds and rain ease by end of day

Thursday, May 3rd, 2018 4:57am MDT

One final day of the cool and wet weather. We’ll see a healthy dose of rain this morning but then this afternoon things will start to settle down and perhaps a bit of sun will appear.

We start out under cloudy skies then by about 1:00pm should start to see coverage break and slowly clear into tonight. Rain will be pretty persistent in the morning then ease in the afternoon and become more scattered in coverage. Temperatures will remain cooler than normal starting off a bit chilly and then reaching a high in the mid-50s.

Tonight, any lingering showers will end entirely in the evening and skies will continue to clear. Overnight low temperatures will be in the upper 30s.

Drier and warmer weather lie ahead for Friday and the weekend.

Keep an eye on current conditions here.

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April 2018 weather recap: Dry conditions, temperatures a bit warmer than normal

Wednesday, May 2nd, 2018 6:02am MDT

The month of April was one that failed to bring much in the way of snow or rain. This exacerbated the growing drought conditions, despite the end of the month bring some relief.

The first third of the month did bring a few days with light snow but nothing that ever amounted to much.  Temperatures overall were a bit warmer than normal during the period and many days featured breezy winds serving to help dry things out.

We then put together three unseasonably warm days from the 10th to the 12th. The 13th saw things cool down but the majority of the snow in the region stayed well east of Thornton.

Perhaps the most notable event of the month came on the 17th when a strong upper level system passed over us. This brought extremely strong winds and resulted in Thornton recording its strongest wind gust in the past 10 plus years (62.1 mph).

Finally on the 20th we started seeing some precipitation with two of the next five days seeing light snow and the others having some rain. The month wrapped up with four straight days of temperatures well above normal.

Thornton’s overall average temperature for the month came in at 48.3 degrees. This was nearly a full degree warmer than the long term Denver average temperature for the month of 47.4 degrees. Out at Denver International Airport where the Mile High City’s official measurements are taken, it was slightly cooler with an average reading of 47.8 degres.

Temperatures in Thornton ranged from a high of 83.6 degrees on the 29th down to our coldest reading of 22.1 degrees on the morning of the 6th and the 7th.  Denver’s maximum and minimum were similar with 83 degrees on the 29th and 21 degrees on the 6th.

In terms of precipitation, Denver averages 1.71 inches of liquid precip during April Thornton saw only 1.07 inches while Denver was even drier with 0.86 inches.

Snowfall at both locations fell short of the April average of 6.8 inches. Thornton recorded 3.9 inches while Denver only saw 1.5 inches.

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

Thornton, Colorado's April 2018 temperature summary. (ThorntonWeather.com)

Thornton, Colorado’s April 2018 temperature summary. (ThorntonWeather.com)

Thornton, Colorado's April 2018 precipitation summary. (ThorntonWeather.com)

Thornton, Colorado’s April 2018 precipitation summary. (ThorntonWeather.com)

1208 PM MDT WED MAY 2 2018




                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
 HIGH              90   04/30/1992
 LOW               -2   04/02/1975
HIGHEST            83   04/29                         79  04/14
LOWEST             21   04/06                         24  04/10
AVG. MAXIMUM     63.2              61.5     1.7     63.2
AVG. MINIMUM     32.5              33.3    -0.8     34.5
MEAN             47.8              47.4     0.4     48.9
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.3    -0.3        1
DAYS MIN <= 32     16              13.0     3.0       15
DAYS MIN <= 0       0               0.0     0.0        0

 MAXIMUM         8.24   1900
 MINIMUM         0.03   1963
TOTALS           0.86              1.71   -0.85     0.98
DAILY AVG.       0.03              0.06   -0.03     0.03
DAYS >= .01         8               9.1    -1.1       10
DAYS >= .10         4               4.5    -0.5        5
DAYS >= .50         0               0.9    -0.9        0
DAYS >= 1.00        0               0.5    -0.5        0
 24 HR. TOTAL    0.34   04/21 TO 04/21           04/29 TO 04/29

         OBSERVED                  NORMAL  DEPART  LAST YEAR`S

TOTALS             1.5              6.8

HEATING TOTAL     509               529     -20     478
 SINCE 7/1       5250              5731    -481     4803
COOLING TOTAL       2                 1       1        0
SINCE 1/1           2                 1       1        0

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

AVERAGE WIND SPEED              12.5

AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC             17


THUNDERSTORMS             3   MIXED PRECIP           0
HEAVY RAIN                0   RAIN                   2
LIGHT RAIN                9   FREEZING RAIN          0
LT FREEZING RAIN          0   HAIL                   0
HEAVY SNOW                0   SNOW                   2
LIGHT SNOW                8   FOG W/VIS <=1/4 MILE   1
FOG                       8   HAZE                   2

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Thornton’s Wednesday’s weather to be cool and wet

Wednesday, May 2nd, 2018 5:03am MDT

Mid-way through our period of unsettled weather, today brings the wettest day of the three.

Mostly cloudy skies will be above initially but soon cloud coverage will become pretty solid. We will see a few periods of light rain this morning then this afternoon coverage and intensity will increase.

Daytime heating may lead to some thunderstorm activity in the afternoon, perhaps with some gusty winds and hail. This evening and tonight look for a good, soaking rain until midnight before easing through the pre-dawn hours tomorrow.

Temperatures today will top off in the mid to upper 50s with lows tonight dropping to around 40 degrees.

Our interactive radar will let you keep an eye on the showers.

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Thornton’s May weather preview: Snow to severe storms

Tuesday, May 1st, 2018 6:11pm MDT
Thornton, Colorado May 2013 weather preview.

Thornton, Colorado May 2016 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.

We begin May 2018 with cool, damp conditions to be followed by a string of mild, pleasant days.  Long range forecasts lean toward we warmer than normal month and one with potentially higher than average precipitation.

The month can 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.

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Cooler and cloudier conditions with some light rain for Thornton’s Tuesday

Tuesday, May 1st, 2018 5:01am MDT

The first of three unsettled weather days for us. Today’s conditions will see temps dip to a bit below normal and turn just a little bit damp.

Mostly cloudy skies will be above throughout the day today with only a few glimpses of sun. Winds will be shifting around quite a bit, relatively calm for much of the day then a bit breezy in the evening.

A few sprinkles of rain may be seen throughout the day. Best chances for activity will come in the mid to late afternoon when a bit of thunder may get mixed in as well. High temperatures today will be in the low to mid-60s.

Tonight, skies remain obscured with a few periods of light rain possible. Lows tonight will be in the low to mid-40s.

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Another unseasonably warm day starts off Thornton’s workweek

Monday, April 30th, 2018 4:57am MDT

Following yesterday’s record-tying warmth, we cool down today but only slightly with temps remaining well above normal. After today though we will see a few days of cooler, unsettled weather.

For today, we start out with mostly sunny skies and will see more of the same for much of the day. The late afternoon does bring a bit of an increase in cloud cover. Winds will be light and out of the southwest then become breezy in the mid-afternoon into the evening. Temperatures once again get a head start after a mild night then will head toward a high in the mid-70s.

Tonight, skies will be mostly cloudy with lows dropping to the mid-40s.

Looking ahead, a cold front arrives tonight and that will begin a three day period of cooler, unsettled weather. Tuesday, Wednesday and Thursday all should see temps a bit below normal and will have varying chances for rain. We should then rebound nicely for Friday and the weekend. Get more details in the extended weather forecast here.

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Denver ties record high temperature for April 29

Sunday, April 29th, 2018 4:59pm MDT

Record High TemperaturesA toasty spring day in the Mile High City.  Afternoon cloud cover cooled things down but not before we tied a record high temperature for today dating to 1948.

At DIA where Denver’s official measurements are taken, the high temperature reached 83 degrees.  Here in Thornton, we were just a bit warmer with a high of 84 degrees.

Both readings were far and above the average high for today’s date of 65 degrees.

Tomorrow promises to be another mild day with highs in the mid-70s but then the weather turns cooler and a bit more unsettled with chances for precipitation Tuesday, Wednesday and Thursday. See our extended forecast for details.

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April 2018 top shots: Monthly photo slideshow

Sunday, April 29th, 2018 4:07am MDT
A Fox vixen hangs out on a pleasant spring evening. (J Martin)

A Fox vixen hangs out on a pleasant spring evening. (J Martin)

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, 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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