Thornton, Colorado, USA
UpdatedSat, 25-Mar-2023 7:10am MDT 


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Thornton’s weekend to feature chilly temps, unsettled conditions

Friday, March 24th, 2023 5:08am MDT

Not exactly the ideal first weekend of spring that you might hope for. While we start out not too bad, overall the weekend will see temps well below normal and we expect some accumulating snowfall.

For today, following some patchy fog, mostly sunny skies will be above in the morning. Highs will top out around 50 degrees. The afternoon sees cloud cover increase and mid-afternoon may see a sprinkle of rain. As temps drop, precipitation will change to snow. Overnight we may see 1 to 2 inches. Lows will be in the mid-20s.

Saturday will be the coldest day of the period with highs only in the upper 30s. Mostly cloudy skies will be above and light snowfall will be possible throughout the daytime hours. Accumulations less than an inch during that period are expected. Saturday night, any lingering snow should end by midnight and skies will begin to clear. Lows will drop to around 20 degrees.

Sunday starts out nice with mostly sunny skies but chilly temps will remain. Highs will be in the low 40s. Cloud cover will again increase Sunday afternoon and the evening may bring some snow although only minimal accumulations are expected. Have a good weekend!

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Thursday continues with the cool temps, another chance for light precipitation

Thursday, March 23rd, 2023 5:17am MDT

Today’s forecast for Thornton looks a lot like yesterday’s. We start out dry and calm but then will see clouds increase and stand a slight chance to see some rain and snow.

Sunny skies start us off with a few clouds this morning. After noon, cloud cover will increase. Highs will reach the low to mid-50s. Late afternoon brings a slight chance for some rain.

As temperatures drop, some graupel and snow may get mixed in as they did yesterday. Overnight, light, non-accumulating snow will continue to be possible. Overnight lows will be in the mid to upper 20s.

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Wednesday in Thornton to offer a day of cool, unsettled weather

Wednesday, March 22nd, 2023 5:08am MDT

Increasing moisture and a passing cold front will mix things up for us today although it won’t be particularly dramatic. Temps will be cooler than normal and there will be some chances for light precipitation.

Partly clear skies will be above for the majority of the day with an increase in cloud cover late. High temperatures look to top out in the low to mid-50s. This morning we may see a few flakes of snow but no accumulation is expected. By mid-morning, some light rain will be possible through the evening.

Winds will be picking up in the mid to late afternoon and become quite blustery overnight. Tonight, any precipitation will end by midnight. Overnight lows will be around 30 degrees with skies gradually clearing.

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Cool temperatures, relatively calm conditions Tuesday in Thornton

Tuesday, March 21st, 2023 4:58am MDT

Nothing particularly exciting about today’s forecast – good or bad. We will see temps right near normal with some breezy winds but that is about it.

Mostly sunny skies will be above most of the day with a bit of an increase in cloud cover in the late afternoon. Winds will be a bit breezy in the afternoon. High temperatures will top out close to the 60 degree mark.

Tonight, partly clear skies will be above with lows around 30 degrees.

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Temperatures near normal, as good bit of cloud cover for Thornton’s Monday

Monday, March 20th, 2023 4:56am MDT

Not too bad of a way to start the workweek. Mercury readings will be near normal although there will be persistent clouds and a slight chance for a rain shower this evening.

For the daytime hours, mostly cloudy skies will be the general rule. Overall, conditions will be calm beyond some slightly breezy winds in the late afternoon. High temperatures will top out in the mid to upper 50s.

A system passing to our north will introduce just a slight chance for a shower of rain from about 6:00pm to midnight. For the balance of tonight, lows will bottom out around 30 degrees under partly cloudy skies.

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March 19 to March 25: This week in Denver weather history

Sunday, March 19th, 2023 4:57am MDT

This Week in Denver Weather History

March is of course one of Denver’s snowiest months, oftentimes bringing our biggest snowfalls of the season. We see this fact bear out in our look back with many events having delivered extraordinary snowfall totals.

From the National Weather Service:


In 1906…an extended cold and blustery period occurred with light snow totaling 14.4 inches over 11 consecutive days. The greatest amount of snow on a single day was 4.0 inches on the 15th. Only a trace of snow fell on the 12th and 17th. High temperatures were below freezing for the entire period. The coldest were 14 degrees on the 16th and 18 degrees on the 17th. Both readings were record low maximums for the dates. Low temperatures were mostly in the single digits. The coldest were 2 degrees below zero on the 16th and 5 degrees below zero on the 19th. Northeast winds were sustained to 22 mph on the 9th. North winds were sustained to 36 mph on the 10th…32 mph on the 13th…and 22 mph on the 15th.


In 1933…rain changed to snow on the evening of the 17th and continued through mid-day of the 19th. Snowfall totaled 5.6 inches with 0.83 inch of precipitation in the city. North winds were sustained to 38 mph with gusts to 46 mph on the 18th and to 30 mph with gusts to 43 mph on the 19th.

In 2003…one of the worst blizzards since historic records began in 1872 struck metro Denver with a vengeance. Heavy wet snow accumulating to around 3 feet in the city and to more than 7 feet in the foothills brought transportation to a near standstill. North winds sustained to 30 mph with gusts as high as 41 mph produced drifts to 6 feet in the city. The estimated cost of property damage alone…not including large commercial buildings…was 93 million dollars… Making it the costliest snowstorm ever. Mayor Wellington Webb of Denver said…”this is the storm of the century…a backbreaker…a record breaker…a roof breaker.” Two people died in Aurora from heart attacks after shoveling the heavy wet snow. The National Guard sent 40 soldiers and 20 heavy duty vehicles to rescue stranded travelers along I-70 east of gun club road. The heavy wet snow caused roofs of homes and businesses to collapse. The snow also downed trees…branches…and power lines. Two people were injured when the roofs of their homes collapsed. In Denver alone…at least 258 structures were damaged. In Arvada…a roof collapse at West Gate Stables killed a horse. Up to 135 thousand people lost power during the storm…and it took several days for power to be restored in some areas. Denver International Airport was closed…stranding about 4000 travelers. The weight of the heavy snow caused a 40-foot gash in a portion of the tent roof…forcing the evacuation of that section of the main terminal building. Avalanches in the mountains and foothills closed many roads…including I-70…stranding hundreds of skiers and travelers. Along I-70…an avalanche released by the Colorado department of transportation…blocked the interstate in both directions for several hours. Several residences between Baskerville and Silver Plume were evacuated because of the high avalanche danger. At Eldora Ski Area…270 skiers were stranded when an avalanche closed the main access road. After the storm ended…a military helicopter had to ferry food to the resort until the road could be cleared. The heavy snow trapped thousands of residents in their foothills homes in Jefferson County for several days. Two homes burned to the ground when fire crews could not reach the residences. Some schools remained closed well into the following week. The storm officially dumped 31.8 inches of snow at the site of the former Stapleton International Airport…the most snowfall from a single storm since the all-time record snowfall of 37.5 inches on December 4-5…1913. The storm made March 2003 the snowiest March on record…the 4th snowiest month on record… And the 5th wettest March on record. The 22.9 inches of snow on the 18th into the 19th was the greatest 24 hour snowfall ever recorded in the city during the month of March. The storm was also a drought-buster…breaking 19 consecutive months of below normal precipitation in the city. Snowfall across metro Denver ranged from 2 feet to more than 3 feet. The highest amounts included: 40 inches in Aurora…38 inches in Centennial and 6 miles east of Parker…37 inches at Buckley AFB…35 inches in southwest Denver…34 inches in Louisville… 32 inches in Arvada…31 inches in Broomfield and Westminster… And 22.5 inches in Boulder. In the foothills…snowfall ranged from 3 feet to more than 7 feet. Some of the most impressive storm totals included: 87.5 inches atop Fritz Peak and in Rollinsville…83 inches at cabin creek…74 inches near Bergen Park…73 inches northwest of Evergreen…72 inches in Coal Creek Canyon…70 inches at Georgetown…63 inches near Jamestown…60 inches near Blackhawk…55 inches at Eldora Ski Area…54 inches 8 miles west of Sedalia…and 46.6 inches at Ken Caryl Ranch. The storm was the result of a very moist…intense slow moving Pacific system which tracked across the four corners and into southeastern Colorado…which allowed deep easterly upslope flow to form along the Front Range.


In 1927…heavy snowfall was 6.5 inches in downtown Denver. Northwest winds were sustained to 28 mph on the 18th.

In 1974…heavy snowfall totaled 5.8 inches at Stapleton International Airport where northeast winds gusted to 33 mph on the 19th.

In 2018…a storm system brought locally heavy snowfall to the Palmer Divide south of Denver.  Storm totals included 10.5 inches in Franktown…10 inches near Elizabeth and The Pinery…9 inches at Ponderosa Park…with 5 inches in Lone Tree. At Denver International Airport…just 0.7 inch of snowfall was observed.


In 2020…a powerful storm system brought blizzard conditions to the plains east of Interstate 25. Numerous roads closures were posted east of Interstate 25 and over the Palmer Divide. Highways closings included portions of eastbound interstates 70 and 76 due to strong winds and whiteout conditions. I-70 was also closed westbound into the mountains due to heavy snow and numerous accidents. In the Front Range Foothills…storm totals included:  23 inches near Nederland…22 inches at Aspen Springs…18.5 inches near Jamestown…17 inches at Genesee…15 inches at Evergreen and 12 inches at Bergen Park.  Along the urban corridor…storm totals included:  11 inches at Centennial and Ponderosa Park; 10.5 inches at Lone Tree…10 inches near Commerce City…with 5 to 9 inches elsewhere including 6 inches at Denver International Airport. At Greeley and Denver International Airport…north-northwest winds gusted to 49 mph.


In 1907…a warm spell resulted in 6 daily temperature records. Record maximum temperatures of 82 degrees occurred on the 18th with 81 degrees on the 19th and 80 degrees on the 20th. Record high minimum temperatures of 52 degrees occurred on the 19th and 20th with 54 degrees on the 21st.


In 1969…high winds buffeted the Front Range foothills causing damage in Boulder and Jefferson counties. A freight train was derailed near the entrance to a canyon 20 miles west of Denver when some empty cars were caught on a curve by a gust of wind. Two light planes were heavily damaged at Jefferson County Airport. Winds gusted to 105 mph at the National Center for Atmospheric Research in Boulder…62 mph in downtown Boulder…and 80 to 90 mph at Boulder airport. Northwest winds gusted to 49 mph at Stapleton International Airport.

In 1976…northwest winds gusted to 55 mph in Denver with stronger winds along the foothills. The strong cold winds kicked up some blowing dust…reducing the visibility to near zero at times at Stapleton International Airport.

In 1982…high winds across metro Denver caused minor damage to a few mobile homes at Lowry Air Force Base. West wind gusts reached 51 mph at Stapleton International Airport where visibility was briefly reduced to 1/4 mile in blowing dust.

In 1995…strong winds associated with a pacific cold front blew across metro Denver. A west wind gust to 48 mph was recorded at Denver International Airport. Winds gusted to 59 mph at the site of the former Stapleton International Airport.

In 2010…a storm system produced deep upslope and brought heavy snow to areas in and near the Front Range. The foothills of Boulder and Jefferson counties were the hardest hit. Storm totals included: 26 inches at Coal Creek Canyon…25.5 inches…4 miles southeast of Conifer; 25 inches at Genesee…24.5 inches near Kittredge… 23.5 inches…6 miles east of Nederland…20.5 inches…3 miles west of Jamestown…5 miles southeast of Aspen Park and 5 miles southeast Idaho Springs; and 18 inches near Ralston buttes. In and around Denver…storm totals included: 15 inches in Golden; 12.5 inches in Boulder…11.5 inches at Lone Tree; 10.5 inches near Castle Pines; 11 inches…6.5 miles southwest of Castle Rock; 10 inches near Englewood…Highlands Ranch and 3 miles southwest of wheat ridge; 9 inches…4 miles west of Arvada…Broomfield…Centennial…Elizabeth and Westminster; 8.5 inches…in southeast Denver and Littleton; 7.5 inches in Louisville and near Thornton; 7 inches…4 miles south of Aurora…Lakewood and Niwot; 6.5 inches…4 miles northwest of Castle Rock…4 miles northwest of Denver and Northglenn; 6 inches in Brighton and 5 miles southeast of Sedalia. Officially… 1.7 inches of snow was measured at Denver International Airport.


Iin 1912…post-frontal heavy snowfall of 6.3 inches was measured in downtown Denver. North winds were sustained to 28 mph with gusts to 30 mph on the 19th. The strong cold front plunged temperatures from a high of 60 degrees on the 19th to a low of 1 degree on the 20th.

In 1959…a major storm dumped heavy snowfall of 7.7 inches on Stapleton Airport where north winds gusting to 44 mph caused much blowing and drifting snow. Many highways were blocked…and there was damage to phone lines along the South Platte River. The storm started as rain and changed to heavy wet snow…which froze on the lines causing the poles to break. The storm caused 2 deaths over eastern Colorado.

In 2006…strong northerly winds…associated with a surface low pressure system that intensified as it moved into the central Great Plains…brought heavy wet snow to the eastern foothills and northeastern plains of Colorado. The hardest hit areas included the foothills of Boulder and Gilpin counties. Storm totals included: 15 inches at Rollinsville… 14 inches at Aspen Springs…12.5 inches near Nederland…and 5.7 inches in the Denver Stapleton area. Strong winds…heavy snow…and poor visibility forced the closure of interstate 70 from Denver east to the Kansas state line. North winds gusted to 32 mph at Denver International Airport on the 19th.


In 1888…heavy snowfall totaled 8.6 inches over downtown Denver. North winds were sustained to 27 mph on the 19th. » Click here to read the rest of March 19 to March 25: This week in Denver weather history

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Thornton to enjoy a calm, cool weekend

Friday, March 17th, 2023 4:48am MDT

While temperatures over the three-day period won’t be overly warm, they also won’t be all that chilly. That, coupled with lots of blue above will make for a nice weekend.

For St Patrick’s Day, mostly sunny to sunny skies will be above. Conditions will be calm and highs will reach the low to mid-40s. Tonight, skies remain mostly clear with lows reaching the mid-teens.

Saturday looks much like today. Sunny skies will be above with highs again in the mid-40s. Saturday night, temperatures will drop to around 20 degrees under mostly clear skies.

We close things out Sunday with the warmest day of the period. Look for highs in the low to mid-50s under sunny to mostly sunny skies.

Get out and enjoy it!

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Following a brief shot of snow, Thornton’s Thursday to be chilly and blustery

Thursday, March 16th, 2023 4:55am MDT

Yesterday’s warmth has given way to a return to wintry conditions. The snow will end soon however although chilly temps and wind will linger.

We start out with cloudy skies and light snow. Total accumulations will be around a half inch or so. Snow will come to an end by around 10:00am. After that, skies will remain mostly cloudy and we will see blustery winds. Highs today will top out in the upper 30s.

Tonight, winds will settle down in the late evening and skies will clear. Overnight lows will be in the mid to upper teens.

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Spring-like temperatures Wednesday but wintry weather arrives tonight

Wednesday, March 15th, 2023 5:00am MDT

Ah yes, a pretty typical Colorado weather day with multiple seasons being experienced within a matter of hours. We do get some pleasantly warm temps during the day but tonight, cold and snow return.

Partly sunny skies will be above throughout the day today, much like yesterday. High temperatures will top out right around the 70 degree mark, perhaps a couple degrees warmer. Conditions will be calm this morning then this afternoon we will see some breezy winds signifying the approaching front.

Cloud cover will increase in the late afternoon and this evening we begin to see a few sprinkles of rain. Light rain then becomes more likely after 8:00pm.

After midnight, temperatures will have cooled enough to see a changeover to snow. Overnight accumulations will be minimal though, less than an inch before dawn tomorrow with the deciding factor being exactly when that changeover occurs.

Lows tonight will be in the upper 20s.

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Thornton to see warmest temps in nearly three months Tuesday

Tuesday, March 14th, 2023 5:00am MDT

You would have to go back to the end of December to see the last time we recorded temperatures like we are going to see today. While there will be some cloud cover, it won’t inhibit the warmth much.

Mostly sunny skies start us off then cloud cover will increase leading to partly clear skies for most of the day. Overall, conditions will be calm and dry. Look for highs in the mid-60s, about 10 degrees above normal.

Tonight, mostly cloudy skies will be above with lows around 40 degrees.

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