Thornton, Colorado, USA
UpdatedSun, 13-Jun-2021 1:40pm MDT 


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Colorado Flood Safety and Wildfire Preparedness Week begins

Sunday, March 7th, 2021 12:01am MDT
Colorado Flood Safety and Wildfire Preparedness

Colorado Flood Safety and Wildfire Preparedness Week, March 3 – 9, 2019.

Floods and wildfires are arguably the two most common disasters Coloradans face with numerous such events occurring each year.  To better prepare residents for the danger of these disasters, this week is Colorado Flood Safety and Wildfire Preparedness Week.

Each day this week the National Weather Service will be posting public information statements covering a number of different topics about floods and wildfires.  These important messages should be required reading for all Coloradans so they know what to do to prepare for these events and handle them when they occur.

ThorntonWeather.com will be posting each of these messages as a service to our readers.  The first of these messages is below.  Check back each day this week for further topics.

600 AM MDT SUN MARCH 7 2021

Flood and wildfire season is approaching. The National Weather Service Offices in Colorado have joined with Colorado Governor Jared Polis to declare March 7 to 13 Colorado FLOOD SAFETY AND WILDFIRE AWARENESS WEEK. Use the information provided during the coming days to help understand your risks from floods and wildfire and make your plans to be prepared.

The National Weather Service wants everyone in the United States to be part of a Weather-Ready nation. Colorado has more than its fair share of floods, flash floods, and wildfires. You should be weather alert and weather-ready, knowing how to stay safe when floods and wildfires affect your area.

Floodprone areas have been identified in over 250 cities and towns and in all 64 counties in Colorado. Over 250 thousand people live in floodplains in Colorado. There are estimated to be 65 thousand homes and 15 thousand commercial, industrial, and business structures in identified floodplains. There are likely many more structures located within unmapped flood hazard areas. The value of the property, structures, and contents located in the identified floodplains is estimated to be around 15 billion dollars.

Floods and flash floods have killed over 400 people in Colorado since the turn of the 20th century. The historic weather pattern of September 2013 reminds us all that floods are a major concern across the Centennial state. Floods have caused billions of dollars of damage in Colorado.

On average, 2500 wildfires occur across Colorado each year. Since 2012, 8 people have been killed when wildfires occurred in the wildland-urban interface.

The National Weather Service forecast offices which serve Colorado will issue a series of public information statements during this Colorado Flood Safety and Wildfire Awareness Week…covering the following topics:

Sunday…Introduction to the week
Monday…Flood watches and warnings
Tuesday…River floods
Wednesday…Flash floods
Thursday…Fire forecasts…watches…and warnings
Friday…Wildfire safety and mitigation
Saturday…Review of the week

More information on floods and wildfires is available at your local National Weather Service web sites…

http://www.weather.gov/denver NWS Dnver/Boulder web site
http://www.weather.gov/pueblo NWS Pueblo web site
http://www.weather.gov/goodland NWS Goodland web site
http://www.weather.gov/gjt NWS Grand Junction web site

Colorado Flood Safety and Wildfire Preparedness Week

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Thornton’s weekend to feature calm conditions, mild temperatures

Friday, March 5th, 2021 4:59am MDT

If you begin to feel a bit of spring fever this weekend, it will be understandable. We are set to enjoy a beautiful weekend with mild temps and calm conditions.

For Friday, after a few early clouds, it will be sunny for the majority of the day. High temperatures will climb to the mid to upper 50s with calm conditions. Tonight, skies remain clear with overnight lows dropping to the upper 20s.

Saturday sees temperatures warm even further. We will have some clouds but nothing too intrusive. Highs will be in the mid-60s. Saturday night, lows will be near freezing under partly cloudy skies.

Sunday’s weather is pretty much a repeat of Saturday. Highs will again reach the mid-60s under mostly sunny skies. Get outside and enjoy it!

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A brief return to wintry weather for Thornton’s Thursday

Thursday, March 4th, 2021 5:19am MDT

In the wake of a few mild days, colder temperatures and the potential for a shot of snow arrive. Precipitation is a certainty, what form that takes is not though.

Mostly cloudy skies start us off but soon we will be entirely cloudy. Winds will be light initially but then north winds become quite breezy in the afternoon. High temperatures today will top out in the mid-40s right about noon, then begin a descent.

As for precipitation, the morning might some sprinkles, perhaps with a few snowflakes mixed in. This afternoon is when the bulk of the moisture arrives with showers becoming likely from noon through the evening.

As mentioned above, there is still a lot of uncertainty about what form the precipitation will take. Temperatures are going to be the key factor as the warmer it is, the more chance for rain versus snow. If it gets cold enough though, we could see an inch or two of the white stuff with an off chance for a bit more.

Tonight, any precipitation should end by midnight and skies will begin clearing. Overnight lows tonight will drop to the mid to upper 20s.

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Warm temperatures, lots of sun for Thornton’s Wednesday

Wednesday, March 3rd, 2021 5:45am MDT

If you liked yesterday’s weather, you will like today’s as well. Wednesday will offer very similar conditions with mile temps are sunny skies.

Clear skies start us off and will be with us throughout the day. Overall conditions will be calm and dry. Look for highs to once again reach the low to mid-60s.

Tonight, skies will be mostly clear with overnight lows in the upper 20s.


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Thornton’s March 2021 preview: Temps warm considerably but snow a very real possibility

Tuesday, March 2nd, 2021 8:49am MDT

The month of March in Denver is usually one that is welcomed heartily by residents. We begin to shake off the cold of winter with warmer temperatures and calmer conditions. That does not mean we are done with snow and cold by any means.

March usually offers healthy snowfall giving us an opportunity to add to our seasonal totals.  While there is good snow potential in March, the month also typically brings much warmer temperatures.

March is historically Denver’s snowiest month and brings about 20% of our annual snowfall.  Heavy, wet spring snow storms can oftentimes bring the entire month’s snowfall total in one monstrous snow.

We also start the transition to spring and severe weather season and the month typically brings our first thunderstorms of the year.  Temperatures climb throughout the month and by the end our average daytime highs are near 60 degrees.

For a complete look at what lies ahead in March 2021, click here.

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Thornton’s Tuesday to feature warmer temperatures, a good dose of sun

Tuesday, March 2nd, 2021 4:59am MDT

A pretty darned nice day ahead for us. We will enjoy warmer than normal temperatures with calm conditions and that beautiful, blue Colorado sky above.

Clear skies start us off and will be with us throughout the day. Winds will be light and out of the southwest this morning, shifting to come from the northeast this afternoon. Temperatures start out cold but will warm up nicely with highs pushing to the upper 50s.

Tonight, skies will be mostly clear with overnight lows dropping to the mid-20s.

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Calm, cool conditions start of Thornton’s workweek

Monday, March 1st, 2021 4:59am MDT

Monday will offer up pleasant, but cool, weather conditions. Temps will be a bit below normal but we will enjoy lots of sun.

Sunny skies start us off this morning and will be with us throughout the day. Overall conditions will be calm and dry. High temperatures toady will top out in the mid to upper 40s.

Tonight, skies will be mostly clear with overnight lows in the low 20s.

What lies ahead for the rest of the week? See the extended forecast here.

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February 28 to March 6: This week in Denver weather history

Sunday, February 28th, 2021 5:00am MDT

This Week in Denver Weather History

Wild weather is a fact of life in Denver and in Colorado in general.  We see that consistently in the history books and this week demonstrates that.  As usual we see high wind events and extreme cold.  Also notable is that as we enter the month of March, we start to see occurrences of those heavy, wet spring snows that can wreak havoc.

From the National Weather Service:


In 1960…heavy snowfall of 6.1 inches at Stapleton Airport on the 22nd and 23rd marked the beginning of a protracted cold spell which lasted until the end of the month.  The cloudy… Cold weather was accompanied by occasional light snow or flurries and fog.  New record low temperatures for the dates were set on the 24th thru the 29th with the lowest temperature of 11 degrees below zero on the 28th.  The seven consecutive days of low temperatures of zero or below had been exceeded in duration only 4 times previously.  New low maximum temperatures for the dates were set on the 23rd… 24th…and the 26th thru the 29th with the lowest maximum temperature of 8 degrees recorded on the 26th.


In 1918…heavy snowfall totaled 9.6 inches in downtown Denver.  Most of the snow…8.4 inches… Fell on the 27th.

In 1931…a major winter storm dumped 12.0 inches of heavy snowfall over downtown Denver.  This is the greatest 24 hour snowfall ever recorded during the month of February. North winds gusted to 18 mph on the 28th.

In 2006…a warm spell resulted in 3 temperature records. The high temperature of 73 degrees on the 27th equaled the record high for the date.  High temperature of 77 degrees on the 28th was a record high for the date and equaled the all time record high temperature for February first set on February 4…1890.


In 1896…northwest winds were sustained to 54 mph with gusts to 65 mph.  The winds warmed the temperature to a high of 56 degrees.  This was the second consecutive day of strong winds in the city.

In 1958…at Stapleton Airport… Snowfall totaled 5.3 inches and northeast winds gusted to 24 mph.


In 2012…another round of high winds occurred along the Front Range foothills. Peak wind gusts included: 84 mph at the National Wind Technology Center; 77 mph…3 miles south-southwest of Boulder; and 75 mph…3 miles southwest of Rocky Flats.  At Denver International Airport…west winds gusted to 36 mph on the 28th and 35 mph on the 29th.


In 1875…6 inches of snow fell from 3:15 pm on the 28th to 1:00 am on the 1st.  Precipitation for the two days was 0.50 inch.


In 1896…southwest winds were sustained to 41 mph with gusts to 60 mph.  This was the third consecutive day that strong winds occurred in the city.

In 1992…Chinook winds gusted to only 25 mph at Stapleton International Airport…but warmed the temperature to a high of 70 degrees…which equaled the record for the date first set in 1940.

In 2004…only light snow fell across metro Denver… While a blizzard raged across northeast Colorado.  Both I-70 and I-76 were closed to the east of Denver by winds gusting to 60 mph producing drifting snow to depths of 2 to 6 feet. Snowfall was only 1.6 inches at the Denver Stapleton site. North winds gusted to 41 mph at Denver International Airport.


In 1896…snowfall totaled 5.5 inches in the city.  Northeast winds gusted to 24 mph.

In 1948…snowfall totaled 5.9 inches in downtown Denver. North winds were sustained to 15 mph.


In 1904…west winds were sustained to 42 mph with gusts as high as 58 mph.  The Chinook winds warmed the temperature to a high of 67 degrees.

In 1906…snowfall was heavy and totaled 7.5 inches over downtown Denver.  Northeast winds were sustained to 37 mph.

In 1940…snowfall was heavy and totaled 7.7 inches in downtown Denver.

In 1943…6.0 inches of snow fell over downtown Denver. North winds were sustained to 19 mph.

In 1956…west-northwest wind gusts to 52 mph were recorded at Stapleton Airport.

In 1961…a wind gust to 65 mph was recorded at the Colorado building in downtown Boulder.  The high winds caused some minor damage.  Northwest winds gusted to 43 mph at Stapleton International Airport.

In 1974…a wind gust to 77 mph was recorded in Boulder. Southwest winds gusted to 37 mph at Stapleton International Airport.

In 2002…upslope conditions caused heavy snow to develop in and near the eastern foothills.  Snow totals included 14 inches at Eldorado Springs and near Genesee; 13 inches atop Lookout Mountain; 12 inches in Coal Creek Canyon; 10 inches in Nederland and just east of Boulder; 9 inches in Boulder and Morrison; and 8 inches at Broomfield…Erie…  Golden…Louisville… And Littleton.  Snowfall totaled 6.5 inches at the site of the former Stapleton International Airport.  Northeast winds gusted to 31 mph at Denver International Airport.

In 2014…a localized band of heavy snow over downtown Denver produced around one inch in less than 30 minutes and contributed to a chain of accidents in the northbound lanes of Interstate 25…between Logan Street and University Blvd. The combination of excessive speed and very poor driving conditions led the chain reaction; it involved 104 vehicles and resulted in one death along with 30 injuries. The interstate was closed for approximately 5 hours. At Denver International Airport…1 inch of snow was observed.


In 1969…heavy snowfall totaled 7.0 inches at Stapleton International Airport where north-northwest winds gusted to 18 mph.

In 1988…3 to 6 inches of snow fell over metro Denver. Snowfall totaled 3.2 inches at Stapleton International Airport where north winds gusted to 32 mph.

In 2003…localized heavy snow developed in the foothills of Jefferson County.  Storm totals included:  12.5 inches near conifer…11 inches in the foothills southwest of Boulder…and 10 inches near Genesee.  Only 0.9 inch of snow fell at the site of the former Stapleton International Airport.


In 1904…west winds sustained to 52 mph with gusts to 60 mph warmed the temperature to a high of 68 degrees. Snowfall was 0.4 inch in the evening.

In 2008…a storm system brought heavy snow to portions of the Front Range foothills; as well as localized blizzard conditions to areas along the palmer divide.  In the foothills of Jefferson and park counties storm totals included:  16 inches at Genesee…14 inches… 4 miles south of Evergreen; 13 inches…3 miles southeast of Pinecliffe; 12 inches…5 miles west-southwest of conifer; 10 inches at Evergreen and 5 miles west of Littleton. Along the Palmer Divide…south and southeast of Denver…  The combination of gusty northerly winds and snow caused localized blizzards.  Storm totals included:  7 inches… 2 miles east of Castle Rock; 6 inches…4 miles east of Parker and 2 miles northwest of Elizabeth; and 5 inches near Castle Pines.  The wind…gusting to 35 mph… Stirred up snow drifts from 1 to 3 feet in depth.  Northeast winds gusted up to 49 mph at Denver International Airport; and 2.0 inches of snow was observed at the former Stapleton International Airport.


In 1901…strong northwest winds raked the city for 2 days. On the 2nd…winds were sustained to 55 mph with gusts to 62 mph.  The Chinook winds warmed the temperature to a high of 72 degrees…a record maximum for the date.  On the 3rd…winds were sustained to 61 mph with gusts as high as 65 mph.  The high temperature was 59 degrees.

In 1964…heavy snowfall of 6.3 inches was measured at Stapleton International Airport.  East winds gusted to only 20 mph behind a cold front.

In 1978…5.0 inches of snowfall were measured at Stapleton International Airport where northeast winds gusted to 24 mph on the 2nd.  The passage of a cold Canadian front kept temperatures only in the teens and 20`s on the 2nd after a high temperature of 33 degrees shortly after midnight. The temperature…after a morning low of 3 degrees below zero…climbed to only 14 degrees on the 3rd… Setting a record low maximum for the date.


In 1963…heavy wet snow was accompanied by strong gusty winds across metro Denver.  Snowfall totaled 11.6 inches at Stapleton Airport where north winds gusting to 44 mph caused much blowing and drifting snow.  Hazardous driving conditions resulted in many traffic accidents.

In 1976…snowfall totaled 8.0 inches at Stapleton International Airport where…on the 4th… Northeast winds gusted to 31 mph reducing the visibility to as low as 1/4 mile.  Maximum snow depth on the ground was 7 inches.  Nine inches of snow were measured in Boulder.


In 1875…six inches of snow fell in Georgetown.

In 1895…northwest Bora winds were sustained to 45 mph with gusts to 58 mph in the city.

In 1966…cold northwest wind gusts of 50 to 90 mph occurred across metro Denver.  Both cars and trucks were blown off an icy highway just east of Denver where some highways were closed by either blowing dust or blowing snow.  A northwest wind gust to 43 mph was recorded at Stapleton International Airport.  The strong winds caused limited minor damage.

In 1972…winds gusted to 55 mph in Boulder causing no reported damage.  West winds gusted to 49 mph at Stapleton International Airport.

In 1985…snow struck metro Denver.  Heaviest hit was Boulder where 6 to 8 inches were measured.  Icy roads caused the closure of I-25 north and south of Denver due to traffic accidents.  The snow also caused long delays at Stapleton International Airport where snowfall totaled only 2.6 inches.

In 1997…west winds gusted to 52 mph at Denver International Airport.

» Click here to read the rest of February 28 to March 6: This week in Denver weather history

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Thornton’s weekend starts warm and windy, ends colder but calm

Friday, February 26th, 2021 5:04am MDT

Not a particularly great weather forecast for the three day period. Today we will see temps climb but wind will be along for the ride. Saturday chills out and in addition to the wind, may bring a few flakes of snow. Sunday sees calm, dry conditions but remains cold.

For Friday, mostly sunny to sunny skies will above throughout the daytime hours. High temperatures today will reach the mid-40s, pushed in large part by downslope winds. Those winds will increase this morning and continue until the late afternoon / evening. Tonight, partly clear skies will be above with lows around 18 degrees.

Saturday brings colder temperatures as another front moves through. Highs will be in the mid to upper 30s under partly clear skies. We once again will have a good dose of wind. As for snow, the afternoon and evening may bring a few flakes but we expect little, if any, accumulation. Saturday night things will settle down and skies will clear. Lows will drop to around 13 degrees.

Sunday will be the most pleasant day of the period but remain chilly. Sunny skies will be above. High temps should reach the mid to upper 30s.

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February 2021 top shots: Monthly photo slideshow

Thursday, February 25th, 2021 9:01am MDT
A frozen lake on the Colorado plains in the depths of winter. (Tony's Takes)

A frozen lake on the Colorado plains in the depths of winter. (Tony’s Takes)

February signifies the start of the climb toward warmer temperatures for the year.  Cold and snow though do intrude but, coupled with milder conditions, there are lots of photo opportunities as can be seen in our monthly slideshow.

The month is one of our least snowiest of the year but it isn’t unusual to see the landscape blanketed in white.  Warming temperatures through the month can bring the onset of spring fever and gives residents the opportunity to enjoy some prolonged time outdoors on the mild days.

Cold or mild, snowy or dry, our scenery is almost always gorgeous – and photo worthy.

  • Slideshow updated February 25, 2021
  • 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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