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Thornton, Colorado, USA
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Thornton to enjoy one more mild day Wednesday, then colder weather arrives

Wednesday, December 9th, 2020 5:23am MDT

Hopefully you have been able to get out and take advantage of the recent warm weather. If not, get out there today, as things look to turn colder starting tomorrow.

For today, sunny skies start us off and will be with us through the morning. This afternoon will bring just a few, high clouds. Overall conditions will be calm and dry. Highs will reach toward the lower 60s.

Tonight, cloud cover will increase as a cold front moves in. Overnight lows will be in the mid-20s.

Looking ahead, tomorrow will be dry but temps will be closer to seasonal norms. Then, we see some chances for light snow Friday and Saturday. Get more details in the extended weather forecast here.

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December 6 to December 12: This week in Denver weather history

Wednesday, December 9th, 2020 5:02am MDT

This Week in Denver Weather History

Denver and Colorado are certainly known for their varied weather conditions and as always, looking back at the weather history books highlights that.  On these dates we have seen Arctic cold and balmy temperatures in the 70’s.  We have seen hurricane force winds and even a rare December thunderstorm.  And as one would expect, there has been plenty of snow.

2-17

In 1939…more than 2 weeks of unseasonably warm weather made the month the 3rd warmest on record.  Seven daily temperature records were set…including the all time record high temperature for the month of 79 degrees on the 5th.  Daytime highs were balmy with 14 days in the 60’s and 70’s.  Low temperatures dipped to freezing or below on only 5 days.  The period was dry with only a trace of snow on the 12th.

3-15

In 1972…a protracted cold spell held an icy grip on metro Denver when maximum temperatures never reached above freezing for 10 consecutive days from the 3rd through the 12th and minimum temperatures dipped below zero on eleven consecutive days from the 5th through the 15th. Daily low temperature records were set with 15 degrees below zero on the 5th…17 degrees below zero on the 6th… And 18 degrees below zero on the 10th.  Daily record low maximum readings were set with 3 degrees on the 6th and 6 degrees on the 9th.  The very cold temperatures were caused by 3 to 5 inches of snow cover and a Canadian air mass.

4-6

In 1960…heavy snowfall totaled 12.0 inches over the 3 days with 5.1 inches on the 4th…5.2 inches on the 5th…and 1.7 inches on the 6th.  Rain changed to snow early on the 4th and ended by early afternoon.  Snow started again early on the 5th and continued through midday on the 6th.  West northwest winds gusted to 30 mph on the 4th.  Post cold frontal temperatures cooled from a high of 38 degrees on the 4th to a low of 7 degrees below zero on the 6th.

5-6

In 1883…a major snow storm hit the city.  Heavy snow fell from 10:00 am on the 5th to 7:30 am on the 6th.  The amount of snowfall was not recorded…but precipitation from melted snow totaled 1.75 inches…which would give an estimated snowfall of nearly 18 inches.  Temperatures during the storm were in the 30’s…so some of the snow May have melted as it fell.  However…railroads were blocked and telegraph lines were downed in all directions.  Telephone wires and poles were nearly all broken down.  The company manager estimated the damage at 30 thousand dollars.  Northeast winds were sustained to 24 mph in the city.

In 1892…heavy snow totaled 6.2 inches in downtown Denver. Most of the snow…6.0 inches…fell on the 6th.

In 2001…high winds developed in the foothills northwest of Denver.  Winds gusted to 74 mph at aspen springs.  West- northwest winds gusted to 35 mph at Denver International Airport…where the temperature warmed to a high of 55 degrees on the 6th.

5-7

In 1978…a major storm dumped heavy snow across metro Denver. At Stapleton International Airport…snowfall totaled 8.5 inches…northeast winds gusted to 46 mph…and temperatures plunged from a high of 49 degrees on the 5th to a low of only 6 degrees on the 6th.  Maximum temperature of 6 degrees on the 7th was a new daily record low maximum reading.  Most of the snow…6.7 inches…fell on the 5th.

5-8

In 1983…high winds occurred in and near the foothills each day.  Wind gusts to 63 mph were registered in Golden Gate Canyon on the evening of the 5th.  On the evening of the 6th…winds knocked down trees…snapped power lines…and blew out windows across metro Denver.  Gusts were clocked to 102 mph in southwest metro Denver…while wind gusts to 38 mph were recorded at Stapleton International Airport.  On the 7th…winds overturned a tractor trailer near Castle Rock. After midnight on the 8th…gusts to 97 mph were reported in southeast Boulder.  Wind speeds of 60 to 70 mph were reported in other parts of metro Denver.

6

In 1939…high temperature of 73 degrees was a record maximum for the date.  Low temperature of 44 degrees was a record high minimum for the date.

In 1967…strong west winds produced blowing dust at Stapleton International Airport where a wind gust to 55 mph was recorded.  A heavy windstorm caused minor damage in Boulder. In Denver…some structural panels were blown from a building… And the screen of an outdoor theater was severely damaged. There were unofficial reports of wind gusts to 75 mph in metro Denver.

In 1977…wind gusting to 85 mph raked the foothills from Boulder to Morrison.  A few houses under construction were blown down.  Northwest winds gusted to 39 mph at Stapleton International Airport.

In 1991…high in the atmosphere…a volcanic ash cloud was clearly visible in the direction of the sun during the late morning and early afternoon.

6-7

In 1953…high winds buffeted the eastern foothills.  Wind gusts to 80 mph occurred on Lookout Mountain.  In Denver winds gusted to 65 mph.  Damage in Boulder totaled 15 hundred dollars.

7

In 1897…west winds were sustained to 53 mph with gusts to 66 mph.  The Chinook winds warmed the temperature to a high of 62 degrees…the warmest day of the month.

In 1957…a vigorous cold front produced a dust storm as it moved south across metro Denver.  West-northwest wind gusts to 59 mph were recorded at Stapleton Airport where the surface visibility was briefly reduced to 1/2 mile in blowing dust.  Light snowfall of only 0.8 inch followed the passage of a secondary Canadian cold front.

In 1958…the worst wind storm in several years caused 10 thousand dollars damage in Boulder where wind gusts were estimated to 75 mph.

In 1977 winds up to 115 mph were reported in the Boulder area where one house was unroofed and another damaged. One woman was knocked down by the wind and injured. Several families were evacuated from homes in Boulder. Damage to trailers and motor vehicles was widespread. West winds gusted to 54 mph at Stapleton International Airport where the Chinook winds warmed the temperature to a high of 64 degrees.

In 1987…strong winds buffeted the Front Range foothills. A peak gust to 93 mph was recorded at the National Center for Atmospheric Research in Boulder.  Nearby…a metal shed was blown over a fence into a tree two houses away.  Wind gusts of 70 to 80 mph were common in Boulder.

In 1988…4 to 8 inches of snow fell across metro Denver and caused traffic gridlock conditions on area highways.  The 3.9 inches of snow at Stapleton International Airport caused two-hour flight delays.  Northeast winds gusted to 25 mph.

In 2005…a brief cold snap resulted in record breaking temperatures.  The low temperature of 13 degrees below zero was a record minimum for the date.  The high temperature of only 3 degrees was a record low maximum for the date.  The cold temperatures were accompanied by 1.4 inches of light snow that was measured at Denver Stapleton overnight on the 6th and 7th.

» Click here to read the rest of December 6 to December 12: This week in Denver weather history

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Another mild, dry day for Thornton’s Tuesday

Tuesday, December 8th, 2020 5:18am MDT

We will be fortunate enough enjoy another, beautiful late fall day today. Highs will once again be well above normal with lots of that beautiful Colorado blue above.

Sunny skies will again be the rule without a cloud in the sky. Winds will be light, conditions calm and dry. We will be aiming for a high temperature in the low 60s.

Tonight, skies remain clear with overnight lows in the upper 20s.

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Clear skies, mild temperatures start off Thornton’s workweek

Monday, December 7th, 2020 5:00am MDT

A high pressure ridge has settled in and will be responsible for a very nice Monday. Temperatures will be well above normal and conditions calm.

Sunny skies will be the rule throughout the day today. Winds will be light and out of the southwest. Highs today will top out in the low 60s, well above the average high for the date of 43 degrees.

Tonight, skies will remain clear with overnight lows in the mid-20s.

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Thornton to enjoy a weekend of calm conditions, mild temperatures

Friday, December 4th, 2020 5:07am MDT

With high pressure dominating and not looking to go anywhere soon, the forecast for this weekend is pretty simple. Above normal temps and lots of blue sky will be the rule throughout.

Friday kicks things off with sunny skies and highs pushing to the upper 50s. Overnight tonight, skies remain clear with lows dropping to the mid-20s.

Saturday does cool down a bit but mercury readings will remain above normal. Look for highs in the low to mid-50s with sunny skies and calm conditions. Overnight Saturday into Sunday, skies will be mostly clear and overnight lows again drop to the mid0-20s.

The weekend closes out on Sunday in fine fashion. Sunny skies will be above with highs in the mid to upper 50s.

Enjoy!

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Thornton’s December weather preview: Winter arrives in earnest

Thursday, December 3rd, 2020 5:40am MDT

Thornton, Colorado's December Weather Preview

Recent months have, overall, been warmer and drier than normal.  Last month continued that trend.  What will December hold for us?

The month of December brings with it the official start of winter and oftentimes, colder and snowier weather conditions.

It however can also offer unseasonably warm temperatures and bone dry conditions.  Given our recent mild and dry weather, we are certainly hoping for a change in the coming month.

Overall December’s monthly mean temperature of 30.0 degrees (1981 – 2010 averages) makes it our coldest month.  Snow is always on everyone’s mind this time of year but December is only our 3rd snowiest month behind March and November with an average of 8.5 inches of the white stuff.

Get all the details on Thornton’s December weather including a look back at historical events and a look at the long range forecast in our December weather preview here.

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Thursday to offer up clear skies, cool temperatures, calm conditions for Thornton

Thursday, December 3rd, 2020 5:05am MDT

A nice looking late fall day ahead for us. We will have virtually cloudless skies and temperatures will be topping out right near average.

Sunny skies start us off and will be with us throughout the day. Winds will be light, overall conditions calm and dry. Highs today will top out a few degrees above the average high for the date of 45 degrees.

Tonight, skies remain clear with overnight lows in the low 20s.

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Chilly temperatures, breezy winds for Thornton’s Wednesday

Wednesday, December 2nd, 2020 5:00am MDT

A relatively uneventful weather day for us but not an overly pleasant one. Temperatures are going to remain cold and breezy winds will make it seem colder.

Mostly sunny skies start us off then we expect to see an increase in coverage later this morning. This afternoon will bring partly sunny skies. Temperatures today will top out only in the low to mid-30s. Breezy, north winds will be a persistent feature, making it seem colder than what the thermometer says.

Tonight, winds will ease and partly clear skies will be above. Overnight lows will be dropping to the mid-teens.

On the plus side, we will be seeing warmer temperatures for the balance of the week and through the weekend.

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First day of December brings cold temperatures, blustery winds and some snow flurries

Tuesday, December 1st, 2020 5:05am MDT

A turn toward wintry weather for Thornton today. The first of two systems will arrive this morning and while it will turn colder, moisture is lacking so we aren’t expecting much snow.

Mostly cloudy skies will be with us throughout the day today. The cold front will push through mid-morning and when it does, winds will be picking up. Blustery winds with gust to 30mph will then be with us into the evening.

High temperatures today will top out in the mid-30s before noon then begin a slow drop from there. As for snow, from noon into the evening, some flurries / light snow will be possible but at this time we are not expecting any accumulations.

Tonight, skies remain mostly cloudy with overnight lows dropping to the upper teens. Again, some light snow and flurries will be possible overnight but with no accumulation expected.

Winter Weather Briefing Page.

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Monday to offer temps a bit above normal, lots of sun

Monday, November 30th, 2020 5:00am MDT

A pretty good looking late fall day ahead for Thornton. It will, in fact, be the nicest day of the week with cold and potentially some snow on tap in the days to come.

Today will see sunny skies above throughout with light winds out of the southwest. We start out quite cold with temperatures in the teens but then will warm up nicely to the low 50s.

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

Looking ahead, a cold front will move in tomorrow and that will bring a chill to the air Tuesday and Wednesday. Snow will be possible over that period but at the current time are not expecting much at all. The later part of the week will see gradual improvement and we should see temps in the 50s for the coming weekend. Get more details in the extended weather forecast here.

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