Thornton, Colorado, USA
UpdatedThu, 19-Jan-2017 6:35pm MST 


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Thornton’s Thursday brings unseasonably warm temps, dry conditions

Thursday, September 8th, 2016 5:09am MST

Our weather today will offer up mercury readings a good bit above normal. With drier air in place, there will be less cloud cover than yesterday and conditions will be calm.

We start out the day with sunny skies that will last until about noon. After that a few high clouds will arrive but nothing that will be obtrusive. Temperatures will be climbing to a high in the mid to upper 80s. Average for today’s date is 82 degrees.

All-in-all, a decent late summer day.

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Warmer temps, some cloud cover for Thornton’s Wednesday

Wednesday, September 7th, 2016 5:16am MST

The remnants of Hurricane Newton which struck Baja California yesterday morning will begin to make itself felt all the way here in Colorado today. Moisture from the storm will be pushing our way although for us it only means clouds versus precipitation.

We start out this morning with a healthy layer of clouds and some spots with patchy fog. By mid-morning we should start to see that burn off although high clouds will be present throughout the day.

Temperatures today will be topping out in the mid-80s, a few degrees above normal. We expect to remain dry with not storms in our area.

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August 2016 weather recap: Thornton enjoys cooler than normal temps but little precip

Tuesday, September 6th, 2016 7:49am MST

Our August weather was a bit of a mixed bag by the two biggest standards.  On one hand, it was cooler than normal which was nice.  On the other, we saw less than half the amount of precipitation we normally see during August.

August typically is when the monsoon kicks in and we see healthy doses of precipitation.  This year however, the monsoonal flow was regularly disrupted by troughs digging in from the north and west.

  • August 2016 top shots: Monthly photo slideshow

We certainly started the month hot with three days of temperatures near or above 95 degrees.  Things then cooled down for a few days as the first trough moved through.  Warmer temperatures then returned with readings not too far off of normal for the next two weeks.  The final 10 days or so of the month then saw cooler conditions with the majority of days recording readings below normal.

Thornton’s overall average temperature for the month came in at 69.5 degrees.  That was three degrees cooler than Denver’s long term average of 72.5 degrees.  Out at the airport where Denver’s official measurements are taken, the airport split the difference with an average of 71.2 degrees.

Temperature ranged from a high of 97.2 degrees on the third of the month down to a cool 46.7 degrees on the 25th.  Denver saw a maximum of 97 degrees on the 9th and a low of 47 degrees on the 25th.  Thornton saw 14 days with highs at or above 90 degrees while Denver recorded 15.

Officially, one temperature record was made.  On the morning of the 27th the mercury at DIA dropped to 48 degrees typing the record low for the date.

In terms of precipitation, Denver averages 1.69 inches during the month of August.  Thornton saw only 0.76 inches in our rain bucket.  The airport fared even worse with only 0.22 inches making the month the eight driest August on record in Denver.

Click here to view Thornton’s August 2016 climate report.

Thornton, Colorado's August 2016 temperature summary. (ThorntonWeather.com)

Thornton, Colorado’s August 2016 temperature summary. (ThorntonWeather.com)

Thornton, Colorado's August 2016 precipitation summary. (ThorntonWeather.com)

Thornton, Colorado’s August 2016 precipitation summary. (ThorntonWeather.com)

From the National Weather Service:

848 AM MDT THU SEP 1 2016




                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
 HIGH             105   08/08/1878
 LOW               40   08/26/1910
HIGHEST            97   08/09                         98  08/15
LOWEST             47   08/25                         43  08/23
AVG. MAXIMUM     86.3              87.2    -0.9     89.8
AVG. MINIMUM     56.2              57.9    -1.7     58.3
MEAN             71.2              72.5    -1.3     74.0
DAYS MAX >= 90     15              11.5     3.5       19
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

 MAXIMUM         5.85   1979
 MINIMUM         0.02   1924
TOTALS           0.22              1.69   -1.47     1.18
DAILY AVG.       0.01              0.05   -0.04     0.04
DAYS >= .01         4               8.6    -4.6        9
DAYS >= .10         1               4.3    -3.3        4
DAYS >= .50         0               1.2    -1.2        1
DAYS >= 1.00        0               0.3    -0.3        0
 24 HR. TOTAL    0.12   08/24 TO 08/24           08/11 TO 08/11
                                                          08/10 TO 08/11

HEATING TOTAL      15                10       5       13
 SINCE 7/1         15                16      -1       18
COOLING TOTAL     218               244     -26      304
 SINCE 1/1        762               688      74      713

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

AVERAGE WIND SPEED              9.9

AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             22


THUNDERSTORM             11     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       5     FOG W/VIS <= 1/4 MILE      3
HAZE                      4

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September preview: The end of summer brings one of our most pleasant months

Tuesday, September 6th, 2016 6:54am MST

Following on what was a cool but dry August, some are certainly hoping for a bit of precipitation.  The month can bring plenty of rain and even our first snow of the season but more often than not, it is one of the most pleasant along the Colorado Front Range.

As temperatures start to drop, September usually reminds us that summer is at an end and fall is now here. Sunshine is predominant though as the month actually has the highest percentage of sun out of any month. Sunny days and clear, cool nights are the standard weather pattern for the month.

The month can bring extremes however.  We will of course forever remember last year’s devastating floods brought on by record-setting rain.  Longtime residents might remember September 1971 which brought over 17 inches of snowfall.

Get a complete look at September’s weather and more details as to what we can expect this year here.

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Tuesday brings cooler temps, chance for storms

Tuesday, September 6th, 2016 5:04am MST

With a low pressure system descending on the state, the weather today gets cooler and a bit unsettled.

Initially we may see some spots of fog and will have mostly cloudy skies above. As the morning progresses some of the cloud cover will burn off but only partly sunny skies will be will be seen for the balance of the day.

Temperatures today will top out in the upper 70s, a bit below the average of 82 degrees for the date. Late afternoon brings a slight chance for thunderstorms with better opportunity occurring after 6:00pm lasting through 10:00pm or so.

When the storms come, use our interactive radar to keep an eye on things.

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September 4 to September 10: This Week in Denver Weather History

Sunday, September 4th, 2016 8:23am MST
This Week In Denver Weather History

September 4 to September 10: This Week in Denver Weather History

The first full week of September sees us start one of the most pleasant times of year in Denver. While less common this time year, severe weather can and does occur. Our look back at this week in Denver weather history includes hail, damaging wind and even smoke from wildfires hundreds of miles away.

From the National Weather Service


In 1995…record breaking heat occurred on the first 5 days of the month when the temperature climbed into the 90’s on each day. Record high temperatures of 97 degrees on both the 1st and 4th equaled the all-time record maximum for the month. High temperature of 95 degrees on the 3rd was a record for the date. High temperatures of 94 degrees on both the 2nd and the 5th were not records. The low temperature of 64 degrees on the 4th equaled the record high minimum for the date.


In 1978…the temperature reached 90 degrees or more on seven consecutive days with the highest temperature…94 degrees… Recorded on both the 4th and 6th.


In 1909…rainfall for the 4 days accumulated to 3.97 inches in Boulder…while in Denver rainfall totaled 2.45 inches on the 4th…5th…and 6th.


In 1909…apparent post-frontal heavy rainfall totaled 1.94 inches in downtown Denver. North winds were sustained to 19 mph.

In 1944…a trace of rain fell. This together with a trace of rain on the 9th…10th…and 30th was the only precipitation for the month. The total of a trace of precipitation for the month equaled the driest September on record first set in 1892.

In 1960…the highest recorded temperature in September…97 degrees…occurred. The same temperature also occurred on September 5…1899…September 1…1995…and September 4… 1995.

In 1989…a strong thunderstorm wind gust flipped a plane taxiing on a private runway in Adams County east of Denver. Two people were slightly injured and the plane was heavily damaged.

In 1992…strong winds developed across metro Denver behind a pacific cold front. Sustained winds above 40 mph with gusts as high as 60 mph were recorded mainly in and near the foothills. Pre-frontal south winds gusted to 37 mph at Stapleton International Airport.

In 1995…two people were injured when lightning struck their home in Lakewood. The lightning entered the attic where it started a small fire. It then traveled through the walls… Exploding a mirror and spraying glass on the residents. Lightning also sparked small grass fires near Aurora…Denver International Airport…and Bennett. The highest recorded temperature in September…97 degrees…occurred. The same temperature also occurred on September 5…1899…September 4…1960…and September 1…1995.

In 2000…thunderstorm winds gusted to 64 mph in Castle Rock.


In 1899…the highest recorded temperature in September…97 degrees…occurred. The same temperature was also reached on September 4…1960…and September 1 and 4…1995.

In 1940…a severe wind and hail storm confined mostly to the west and north parts of the city occurred shortly after 4:30 pm. Hail stones ranged in size from 1/4 to 1/2 inch in diameter. In north Denver…hail piled to a depth of 4 inches. Flooding occurred in one underpass…which stalled 2 cars. One girl was injured when the weight of the hail flattened a porch on which she stood. Northeast winds were sustained to 29 mph with gusts to 32 mph in downtown Denver.

In 1987…a thunderstorm complex produced hail as large as 1 3/8 inches in diameter…2 miles east of Buckley Field in Aurora. No damage was reported.


In 1988…layers of smoke aloft from large forest fires in Yellowstone National Park completely obliterated the sun at times. At Stapleton International Airport…surface visibility was reduced at times to 5 and 6 miles in smoke.


In 1940…a thunderstorm pelted the city with small hail. The storm produced some lightning damage. One woman was stunned by a bolt which struck near her. Heavy rain from the storm raised the level of Cherry Creek by more than 3 feet during the height of the storm. Rainfall downtown was only 0.26 inch.

In 1988…strong winds blew down two houses that were under construction in Castle Rock. Northwest winds gusted to 44 mph at Stapleton International Airport.

In 1993…a man was struck and killed by lightning while standing outside his home in unincorporated Arapahoe County 11 miles south of Denver. Lightning also struck a cabin in Marshdale…20 miles southwest of Denver…which started a fire and damaged one room and a portion of the roof.

In 1995…hail as large as 3/4 inch in diameter fell in Coal Creek Canyon in northern Jefferson County.

In 2001…a thunderstorm dropped 3/4 inch diameter hail in Aurora near Cherry Creek.


In 1875…the creeks were running dangerously high during the night from heavy rains in the mountains.

In 1885…a thunderstorm produced very white hail of irregular shape and about the size of beans. Precipitation was only 0.10 inch.

In 1971…a vigorous cold front accompanied by a thunderstorm produced wind gusts to 48 mph at Stapleton International Airport and much upslope cloudiness and light rain across metro Denver.

In 1989…widespread thunderstorms produced lightning strikes that knocked out power to about 13 thousand homes in Boulder County. In a rugged area stripped of vegetation by a forest fire earlier in July…heavy rain triggered mud slides that destroyed one home and severely damaged another in Boulder Canyon 10 miles west of Boulder. In one home…the mud caved in an exterior wall and poured into the residence only seconds after 2 people had evacuated the premises. Rainfall totaled 1 to 3 inches. Hail 1 3/4 inches in diameter fell in Nederland…Idaho Springs…and Golden Gate Canyon. Hail 1 inch in diameter was measured 10 miles north of Golden.

In 1993…thunderstorm winds toppled an overhead sign onto the intersection of I-70 and I-25 in Denver…causing considerable damage to 4 vehicles. The winds also caused a police car to be blown off the road northeast of Denver. Thunderstorm winds gusting to 66 mph damaged the siding of a residence southeast of Brighton. A thunderstorm wind gust to 53 mph was recorded at Stapleton International Airport. Hail to 7/8 inch in diameter fell at Kittredge in the foothills of Jefferson County.

In 1994…lightning severely damaged a public television transmitter atop Squaw Mountain west of Denver.

» Click here to read the rest of September 4 to September 10: This Week in Denver Weather History

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Labor Day weekend to offer above norm temps, a couple chances for storms

Friday, September 2nd, 2016 5:03am MST

Overall the holiday weekend weather is going to offer good opportunities for barbeques and outdoor activities. We do start out with some chances for thunderstorms and will see the mercury rising after today.

For Friday there is a good bit of moisture aloft and that is going to bring in some cloud cover. Temperatures will be topping out right near the average for today’s date of 84 degrees. Some thunderstorms will be possible through much of the day although most of the excitement is expected to be to our east.

Saturday brings more sun and warmer temperatures. Look for highs in the mid to upper 80s. The afternoon brings slight chances for thunderstorms.

Drier and hotter conditions will be on tap for Sunday. We will see a healthy dose of sun above and temperatures in the low 90s. Right now we aren’t expecting any thunderstorm activity.

For the Labor Day holiday, it cools slightly and will be quite pleasant. Temperatures will be topping out in the upper 80s and we should be dry.

Enjoy your holiday weekend!

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Thursday brings rising mercury, continued dry conditions

Thursday, September 1st, 2016 5:00am MST

For the most part, the weather today will be similar to yesterday’s sunny and dry conditions. The one change will be the temperature which will climb to levels just a bit above normal.

We start out the day with sunny skies and then will see a few clouds as the day progresses. No shower or thunderstorm activity is expected. Temperatures will start out on the cool side but then climb to a high in the mid-80s.

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Pleasant temperatures, calm conditions for Thornton’s Wednesday

Wednesday, August 31st, 2016 5:26am MST

Yesterday ended up putting on a very cool light show after dark but precipitation stayed south of Thornton. Today we again expect to be dry and overall conditions should be quite nice.

We start out with a few clouds then will see mostly sunny skies for the middle part of the day. Mid to late afternoon will see a slight increase in the cloud cover. Temperatures will be topping out in the low 80s making for a very comfortable day.

Right now it looks like any thunderstorm activity will be well to our south and east.

Have a great day!

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August 2016 top shots: Monthly photo slideshow

Wednesday, August 31st, 2016 3:00am MST
August 11, 2016 - An evening thunderstorm brings a gorgeous rainbow. (Shannon Dizmang)

August 11, 2016 – An evening thunderstorm brings a gorgeous rainbow. (Shannon Dizmang)

As the calendar turns to August, the summertime heat begins to fade and that makes it easier to get out and enjoy all of the outdoor activities Colorado has to offer.  From a walk in a park to afternoon thunderstorms to an abundance of wildlife, photo opportunities abound as is seen in our slideshow.

Our monsoon season typically arrives about now and that means better chances for moisture.  However with limited instability, the intensity of storms are more sedate.  That doesn’t mean however that the weather is any less photographic.

  • Slideshow updated August 31, 2016

By the end of the month some of our seasonal feathered friends will be looking to leave the state giving our last chance to see them till spring.  Larger mammals are gearing up for the rut (mating season) and that can make for some intense scenes.

Showcasing images captured by ThorntonWeather.com readers as well as some of our own, our monthly slideshow covers the entire gamut of weather and nature related imagery. Sunsets, sunrises, wildlife and of course every type of weather condition are vividly depicted.

To learn more about how to send your photo to us for inclusion in the slideshow, see below the slideshow.

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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