Thornton, Colorado, USA
UpdatedFri, 28-Apr-2017 6:00am MDT 


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Cool, damp weather for Thornton’s Tuesday

Tuesday, November 22nd, 2016 5:07am MDT

Not much but we are at least receiving a little bit of precipitation. Coupled with the moisture, we will be much cooler today and have some breezy winds.

We start out the day with cloudy skies and slight showers although most of the activity is just to our east. Right now it looks like it will be tough for those to transition to snow but it is possible. Look for the precipitation to start tapering off by about 8:00am, coming to an end in the early afternoon.

We will see an increase in wind speeds this morning with breezy winds lasting through the day. By mid to late afternoon some sun should start peeking out. Temperatures today will be topping off in the mid to upper 40s, right below or close to normal.

Keep an eye on the shower activity with our interactive radar here.

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Thornton’s workweek starts warm with chance for showers

Monday, November 21st, 2016 4:58am MDT

We will enjoy a mild day today but also with a healthy bit of cloud cover. Later today a system will arrive bringing a chance for rain showers and possibly some light snow into tomorrow morning.

Look for mostly cloudy skies to be above throughout the day today. Winds start out coming out of the south but then will shift north as a system arrives in the afternoon. Temperatures will be climbing to a very comfortable range in the low to mid-60s.

The afternoon may bring a sprinkle of rain with some better chances in the evening. From about 11:00pm into tomorrow morning we will have better opportunities, perhaps with some light snow mixed in during the early morning hours. We are not expecting much precipitation in either form at this time.

Have a great day!

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November 20 to November 26: This Week in Denver Weather History

Sunday, November 20th, 2016 5:45am MDT
This Week In Denver Weather History

November 20 to November 26: This Week in Denver Weather History

With the Thanksgiving holiday approaching, travelers cast a wary eye on Denver’s weather and in our look back at this week in Denver weather history we see they have had cause for concern in the past. Snowstorms and wind have caused their share of problems. Also notable, it was 140 years ago that Denver’s first official weather observation occurred.

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From the National Weather Service:


In 1930…a major storm dumped a total of 13.6 inches of snowfall over downtown Denver. Most of the snow…9.4 inches…fell on the 19th when north winds were sustained to 23 mph. This was the only measurable snow of the month. Temperatures hovered in the 20’s and lower 30’s.

In 1956…an intense winter storm dumped 12.8 inches of snowfall on metro Denver. Strong north-northeast winds gusting to 33 mph at Stapleton Airport frequently reduced the visibility to 1/2 mile in snow and blowing snow on the 19th. Most of the snowfall…10.7 inches…occurred on the 19th.


In 1979…a heavy snowstorm buried most of Colorado under at least a foot of snow. Snowfall at Stapleton International Airport totaled 17.7 inches…the greatest snow depth since 1946. Winds to 60 mph produced 5-foot drifts paralyzing the city as temperatures hovered in the 20’s. While small airports closed…Stapleton remained open…but with long delays that snarled thanksgiving holiday traffic. Schools and businesses closed and postal deliveries were delayed. Almost all major highways leading out of Denver were closed to traffic for periods of time on the 20th and 21st. Most of the snow…13.5 inches…fell on the 20th. At Stapleton International Airport…north winds gusted to 35 mph on the 20th and to 38 mph on the 21st.


In 1871…the first official weather observation in Denver… Was taken by Henry Fenton…observer sergeant of the united states army signal service at 5:43 am. The office was located on the 2nd floor of a building at the corner of Larimer and g streets…now 16th street. The daily weather journal hand written entry for the day follows: “Snow fell heavily during past night. At 5:43 am it was snowing light and continued until 8 am. Wind during snow storm gentle and a little west of south…and continued there during the remainder of the day. Sky clear after 8 am. Very cold weather prevailed all day and night. Thermometer at 9:43 pm 14 degrees. Rain gauge and self-registering thermometer not in position owing to severe storm last week. Barometer falling during the morning and rising rapidly at night.”

In 1894…northwest Chinook winds sustained to 40 mph with gusts to 45 mph warmed the temperature to a high of 58 degrees in the city.

In 1909…steady and very strong winds in Boulder caused 3 thousand dollars in damage.

In 1915…post-frontal northeast winds sustained to 40 mph with gusts as high as 42 mph produced only a trace of snow. It was windy most of the day.

In 1923…west winds were sustained to 42 mph with gusts to 44 mph before daybreak. The strong winds persisted in the city for only about 3 hours.

In 1993…a wind gust to 72 mph was recorded at Table Mesa in southwest Boulder.

In 1994…winds gusted to 77 mph atop Squaw Mountain west of Denver. West winds gusted to 40 mph at Stapleton International Airport.


In 1898…snowfall totaled 4.0 inches in downtown Denver. Northeast winds were sustained to 48 mph with gusts as high as 60 mph behind an apparent cold front on the 20th… When temperatures plunged from a high of 66 degrees to a low of 9 degrees. On the 21st the high was only 24 degrees and the low was 2 degrees.

In 1970…a wind gust to 94 mph was recorded at gold hill in the foothills west of Boulder. Strong winds also swept across metro Denver. Wind gusts reached 59 mph in downtown Boulder…while at Stapleton International Airport west- northwest winds gusted to 43 mph on the 21st. Damage was minor.

In 1992…a large Canadian air mass moved into the state at the same time an upper level storm system approached from the west. The combination of cold air at the surface and very moist air aloft produced heavy snow across the entire state. Snowfall totaled 6.3 inches at Stapleton International Airport…where north winds gusted to 23 mph on the 20th. Snow was heavier in the foothills…with 14 inches at Wondervu…13 inches at Aspen Springs…Conifer… Boulder…and Gross Reservoir…8 inches at Rollinsville… And 10 inches at Golden Gate Canyon and Morrison.

In 2007…a storm system brought moderate to heavy snowfall to portions of the urban corridor. Storm totals included: 7 inches…3 miles south-southeast of Fort Collins…with 6 inches in Boulder and at Horsetooth Inlet Bay. Elsewhere… Storm totals ranged from 2 to 5 inches. Snowfall totaled 2.0 inches at the site of the former Stapleton International Airport.


In 1891…northwest winds were sustained to 50 mph with gusts to 60 mph.

In 1899…a trace of snow fell in the city. This…together with a trace of precipitation on the 16th and 23rd…was the only precipitation of the month…making the month the driest on record. The record was equaled in November of 1901 and 1949. This trace of snow along with a trace of snow on the 23rd was the only snow of the month…ranking the month the 2nd least snowiest on record. This record was equaled in November of 1884…1901…1905…1917…and 1939.

In 1900…west winds were sustained to 46 mph with gusts to 54 mph. The Chinook winds warmed the temperature to a high of 64 degrees.

In 1934…the latest date for the first measurable snow of the season occurred. This was not the first snow of the season… Because traces of snow had fallen earlier in September. Snowfall totaled only 1.0 inch over downtown Denver.

In 1962…strong west-northwest Chinook winds gusted to 53 mph at Stapleton Airport.

In 1998…an intense mountain wave allowed for high winds to develop in the foothills of Boulder County. Wind gusts as high as 77 mph were measured 3 miles east- northeast of Nederland.


In 1905…a trace of snow fell on both days in downtown Denver. This was the only snow of the month…ranking the month along with other Novembers…the 2nd least snowiest on record.

In 1999…the first significant snowfall of the season struck metro Denver. Snowfall totals included: 16 inches near Bailey; 13 inches near Evergreen; 12 inches at north turkey creek…Genesee…near Morrison…and near Sedalia; 11 inches near Conifer and in Evergreen; 10 inches in Louisville; 9 inches in Brighton…Broomfield…and Denver; and 8 inches at Arvada…Castle Rock…and Eldorado Springs. Snowfall totaled 8.4 inches at the site of the former Stapleton International Airport.

In 2003…heavy snow fell in and near the foothills of Boulder County. Snowfall totaled 10.5 inches in Eldorado Springs. Across the city…snowfall was lighter with 2.8 inches measured at the site of the former Stapleton International Airport on the 22nd. North winds gusted to 32 mph at Denver International Airport on the 22nd.


In 1918…post-frontal snowfall totaled 5.9 inches in downtown Denver. Most of the snow…5.3 inches…fell on the 22nd. North winds were sustained to 20 mph on the 21st.

In 1931…a major storm dumped a total of 13.2 inches of snowfall over downtown Denver. Most of the snow…11.4 inches…fell on the 21st. A very cold air mass settled over the city after the heavy snow on the 21st. After a low temperature of zero…the temperature climbed to a high of only 5 degrees on the 22nd…a record low maximum for the date.


In 1952…snowfall of 6.2 inches was measured at Stapleton Airport where northeast winds gusted to 17 mph on the 21st.

» Click here to read the rest of November 20 to November 26: This Week in Denver Weather History

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Thornton’s weekend to bring a return to dry conditions, warming temperatures

Friday, November 18th, 2016 5:08am MDT

It is about time! Yesterday we received our first snowfall of the season and our first precipitation in more than a month. We now rebound nicely with a return to calm, dry weather conditions and warming temperatures over the three day period.

For Friday, we start out quite cold and warming will be a bit limited. Look for highs today to be near 40 degrees under sunny skies. Overnight lows will be dropping back to the teens.

Saturday sees a warmup in earnest. Highs will be in the low to mid-50s, a bit above normal, under sunny skies. Overnight Saturday into Sunday lows dip to near freezing.

Sunday will bring the warmest day of the period with highs in the mid-60s. Sunny skies and dry conditions will continue.

Have a great weekend!

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First snow of the season finally set to arrive in Thornton

Thursday, November 17th, 2016 5:04am MDT

Following on weeks of dry, unseasonably warm weather, we finally are set to see a transition to weather more appropriate for this time of year. Temperatures are going to be far below yesterday’s record-setting levels and our first snow of the season is on tap.

We start the day with mostly cloudy skies but soon things will be obscured completely. Temperatures today will be topping out close to the 40 degree mark around noon then decreasing after that. Winds this afternoon will be picking up causing it to feel a bit uncomfortable outside.

In terms of the coming precipitation, we may see a flurry early but don’t expect much until mid-morning and closer to noon lasting into this evening. Right now it looks like the daytime will see a rain / snow mix, possibly up to an inch of accumulation of the white stuff on grassy areas. This evening as things cool down it will move to all snow with up to another inch possible before midnight.

Keep an eye out for the developing showers with our interactive radar here.

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Denver ties all-time record high temperature for month of November

Wednesday, November 16th, 2016 3:41pm MDT

Record High TemperaturesWe thought the daily high temperature record for November 16 would fall today and indeed it did.  However the Mile High City also managed to tie the record for the warmest temperature ever recorded during the month of November.

At 1:24pm the station at Denver International Airport reported a mercury reading of 80 degrees.

This easily bested the previous record high temperature for November 16 of 77 degrees set in 1941.

Perhaps more notably, the reading also ties the all-time record high temperature for the month of November.  The old mark was 80 degrees set on November 8, 2006.  This is in turn the latest in the year an 80 degree reading has been tallied.

Here in Thornton, we were a bit warmer than DIA.  Our temperature topped out at 81.5 degrees at 1:02pm.

Showcasing the wide swings of weather we experience here in Colorado is the fact that after these records today, high temperatures tomorrow won’t go very far into the 40s.  Check out forecast for the latest.

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Potentially record-setting highs Wednesday before snow Thursday

Wednesday, November 16th, 2016 5:03am MDT

From one extreme to the next over the next 48 hours for Thornton. We begin with high temperatures that are likely to break records and will end with much colder temperatures and a quick shot of snow.

For today we will see partly sunny skies above. Their impact on mercury readings isn’t expected to be all that great however but may play a factor in our final high reading for the day. Conditions will be dry and relatively calm although some breezy winds can be expected from late morning into the afternoon.

In terms of temperatures, we are expecting highs to push very close to the 80 degree mark. Denver’s record high temperature for today’s date is 77 degrees set in 1941. Additionally, the warmest temperature ever recorded in the Month of November is 80 degrees set in 2006. Both marks may be in jeopardy.

After the heat, the cold. A cold front will move through tomorrow morning coupled with a trough arriving later in the day. Coupled together, we are going to see much colder temperatures tomorrow with highs only around 40 degrees.

A few sprinkles of rain may be seen in the morning before a transition to snow occurs lasting into Thursday evening. Right now it appears an inch or two of the white stuff will be possible however much of that is expected to melt quickly as the ground is quite warm.

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Near record-setting high temperatures expected Tuesday

Tuesday, November 15th, 2016 5:14am MDT

We finally see an end to our extraordinarily warm weather ahead. However, before that comes, we will be seeing a couple of days with temperatures challenging record highs.

For today look for sunny skies to be above throughout the day. Winds will generally be calm and out of the southwest, conditions try. The mercury will be climbing toward a high in the upper 70s, coming very close to the record high for the date of 78 degrees set in 1942.

Looking ahead, tomorrow will offer similarly mild temperatures, perhaps a couple of degrees cooler. After that, a trough is expected to dig in Thursday and as it does a low pressure system will move in allowing colder air from the north to be pulled down. This will translate into below normal temperatures Thursday and Friday.

In terms of precipitation, right now it looks like we may start with some rain Thursday afternoon changing to a rain / snow mix overnight Thursday. It is a bit too far out to start throwing out numbers but we could see an inch or so of the white stuff, sticking only to grassy areas. More in our extended forecast here.

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2016 ‘Likely’ Hottest Year Ever: WMO

Monday, November 14th, 2016 2:16pm MDT

2016 will “very likely” be the hottest year on record, according to the United Nations World Meteorological Organization. According to a news release from the WMO, 2016 will likely eclipse the previous hottest year, 2015. “Another year. Another record. The high temperatures we saw in 2015 are set to be beaten in 2016,” said WMO Secretary-General… » Click here to read the rest of 2016 ‘Likely’ Hottest Year Ever: WMO

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Thornton’s workweek starts with mild temps, dry conditions

Monday, November 14th, 2016 5:30am MDT

Here we go again. High pressure continues its domination and that will lead to more mercury readings well above normal. We do however finally see us breaking out of this pattern by the latter half of the week.

For today we will enjoy mostly sunny skies above throughout the day. Winds will be light and out of the southwest, conditions dry. Temperatures will be climbing to a high of around 71 degrees, far above the average for the date of 53 degrees.

Looking ahead, we’ll see even warmer temperatures tomorrow and Wednesday, potentially record setting. Thursday brings change although models are still not in agreement as to exactly what is going to happen. We do expect temperatures to be close to normal Thursday with possibly some rain. Then Thursday night, depending on the exact track and intensity of the system, we may see snow overnight into Friday morning.

Have a closer look in the extended weather forecast here.

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