Thornton, Colorado, USA
UpdatedFri, 29-Sep-2023 8:35am MDT 


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April 30 to May 6: This week in Denver weather history

Sunday, April 30th, 2023 4:52am MDT

This Week in Denver Weather History

May can bring a variety of conditions from snow and cold to severe thunderstorms and flooding rains. Looking back at this week in Denver weather history we see where all of those events have made an appearance in our past.

From the National Weather Service:


In 1964…several weeks of dry weather and windy conditions across the Great Plains to the east caused noticeable suspended dust to invade metro Denver. At Stapleton International Airport east winds gusted to 28 mph and visibility was reduced to 5 miles.

In 1989…a late season snowstorm dropped 2 to 4 inches of snow across metro Denver with 6 to 12 inches in the foothills. Snowfall totaled 3.9 inches at Stapleton International Airport where northeast winds gusted to 23 mph and the greatest snow depth on the ground was 2 inches due to melting.

In 1991…a pacific storm dumped heavy wet snow across metro Denver. The foothills were hit the hardest where snowfall amounts ranged from 16 inches at Evergreen to 5 inches at Idaho Springs. Lower elevations of metro Denver received 5 to 9 inches of snowfall with 5 inches in Boulder and 7.0 inches at Stapleton International Airport where northeast winds gusted to 25 mph. The weight of the snow caused power lines to fall and tree limbs to snap…producing power outages in parts of Denver…Aurora…and Westminster.

In 1999…heavy snow fell overnight in the foothills above 7500 feet elevation. Snowfall totals included: 13 inches near Rollinsville…10 inches near Evergreen…8 inches at Blackhawk and Nederland…and 7 inches at Conifer. Only rain fell across the city with 2.13 inches recorded at Denver International Airport.


In 1954…a major storm dumped 10.1 inches of snowfall at Stapleton Airport. Most of the snow…7.5 inches…fell on the 29th and 30th. The maximum snow depth on the ground was 5 inches on the 30th due to melting. No strong winds accompanied the storm.


In 1896…northwest winds were sustained to 55 mph with gusts as high as 64 mph in the city.

In 1960…the minimum temperature dipped to 22 degrees at Stapleton Airport. The sub-freezing cold damaged fruit trees and some other crops in the area.

In 1967…west winds gusted to 51 mph at Stapleton International Airport. Winds were strong and gusty across all of metro Denver.

In 1972…hail 1/2 to 3/4 inches in diameter fell at Stapleton International Airport. Northwest winds gusted to 35 mph.

In 1980…a cold air funnel touched down several times near Louisville.

In 1983…mothball-size hail fell in Wheat Ridge.

In 1992…the all-time highest recorded temperature in April… 90 degrees…occurred. This is also the earliest 90 degree reading for the season. In addition…the temperature dipped to a low of only 56 degrees…setting a record high minimum for the date.

In 1995…hail…up to 3/4 inch in diameter…fell at Denver International Airport. The hail was soft…lasted for only 8 to 10 minutes…and caused no damage.

In 2002…drought conditions started to have an effect on greater metro Denver. April…normally the third snowiest month of the year in Denver averaging just over 9 inches of snow…ended with only a trace of snow…ranking the month… Along with previous Aprils…the 2nd least snowiest on record. The month ended with only 0.23 inch of liquid precipitation making the month the 3rd driest on record. Mountain snowpack was less than half of normal for this time of year. A statewide drought emergency was declared by the governor.

In 2003…a small tornado touched down 10 miles east of Hudson… But did no damage. Hail as large as 3/4 inch in diameter fell in Aurora near Cherry Creek.

In 2004…post-frontal upslope flow produced light snowfall across metro Denver. Snowfall was 4.0 inches at Denver Stapleton…while the temperature hovered in the lower 30’s all day. The high temperature was only 33 degrees…a record low maximum for the date. The low temperature of 30 degrees was not a record. North winds gusted to 20 mph at Denver International Airport.


In 1980…to the west of Denver…heavy rain changing to snow buried the foothills above 7 thousand feet in 4 to 8 inches of snow. Precipitation in the foothills ranged from 1 to 3 inches…which caused some local flooding. Rain fell at lower elevations. Rainfall at Stapleton International Airport totaled 1.05 inches from the storm.


In 1902…northwest winds were sustained to 68 mph with gusts as high as 74 mph in the city during the early morning. The apparent very strong Chinook winds warmed the temperature to a high of 78 degrees.

In 1912…south winds were sustained to 42 mph with gusts as high as 58 mph. South to southwest winds were strong all afternoon.

In 1935…a moderate duststorm blew into the city at around 2:00 pm on northwest winds sustained to 17 mph with gusts to 19 mph. Later in the afternoon…the dust receded to the east in advance of a rainstorm from the west.

In 1988…very strong winds behind a vigorous cold front produced a blinding dust storm that closed I-70 east of Denver. Northeast winds over metro Denver peaked to 45 mph at Stapleton International Airport…but only kicked up some blowing dust. The temperature plunged from a high of 76 degrees at midday to 36 degrees at midnight as light rain changed to light snow.

In 1991…3/4 inch diameter hail fell at Standley Lake in northwest metro Denver.

In 1999…heavy snow developed in the foothills above 7 thousand feet elevation. Snow totals included: 10 inches at Rollinsville…7 inches near conifer…and 6 inches atop Crow Hill. Rain fell across metro Denver.

In 2015…a teenager was critically injured when he struck by lightning near Town Center Mall in Aurora. He was standing on a hill in an open field. A severe thunderstorm produced hail up to quarter size near Evergreen.


In 1903…post-frontal rain changed to light snow overnight… But totaled only 2.0 inches. This was the last snow of the season. Northeast winds were sustained to 45 mph with gusts to 48 mph on the 1st.


In 1898…snowfall totaled 15.5 inches in downtown Denver. Most of the snow…6.2 inches…fell on the 3rd. Most of the snow melted as it fell. The greatest snow depth on the ground was only 2.5 inches on the 3rd at 8:00 pm. This was the only snowfall during the month. Northeast winds were sustained to 22 mph on the 1st.


In 1874…strong winds upset two railroad passenger coaches near Georgetown. The baggage was retrieved and placed in a heavy…large wagon. The passengers then seated themselves on top of the baggage. Another strong gust of wind upset the wagon. The driver’s shoulder was dislocated…and a passenger’s leg was badly injured. In Denver…northwest winds increased and blew in gusts and heavy winds were observed on the ridge tops. On the Kansas Pacific R.R. east of Denver…the wind was so strong that it blew the train back several lengths…which caused the train to be about 7 hours late arriving in the city.

In 1901…south winds were sustained to 50 mph with gusts to 60 mph from an apparent thunderstorm with hail.

In 1944…snowfall of 8.3 inches was accompanied by a thunderstorm. This was the last snowfall of the season and the only snow of the month. Northwest winds were sustained to 25 mph.

In 1955…southwest winds at speeds of 37 mph with gusts as high as 58 mph caused some blowing dust at Stapleton Airport.

In 1983…1 inch diameter hail fell a few miles south of Bennett.

In 1984…3/4 inch diameter hail fell in Northglenn.

In 1988…I-70 east of Denver was closed for the second straight day…this time due to snow and blowing snow producing up to 2 foot drifts. While only 2 to 4 inches of snow fell across metro Denver…Strasburg…just east of Denver…received a foot of snow. North winds peaked to 51 mph at Stapleton International Airport where snowfall totaled only 1.3 inches.

In 1995…lightning struck a house in Westminster sparking an attic fire.

In 2015…a sudden wind gust associated with a dissipating thunderstorm caught some flags attached to a lift and tipped it. Two men were injured when a lift at Civic Center Park in Denver fell on them during Cinco de Mayo festivities. Both men suffered from head injuries…one was in serious condition.


In 1979…heavy rain changed to snow on the 2nd. Snowfall totaled 3.9 inches at Stapleton International Airport… Where northwest winds gusted to 26 mph. The greatest depth of snow on the ground was only 1 inch at midday on the 2nd due to melting. Total precipitation for the 2 days was 1.65 inches.


In 1987…a slow moving storm brought rain…wind…and snow to metro Denver. Rainfall totaled 1.04 inches at Stapleton International Airport where north winds gusted to 48 mph on the 3rd. The foothills received 5 to 10 inches of snow.


In 2001…a very slow moving pacific storm system became parked near the four corners region…which allowed heavy snow to develop above 6500 feet in the foothills with a mix of rain and snow over lower elevations of metro Denver. Snowfall totals included: 21 inches atop Crow Hill and at Idaho Springs; 19 inches near Blackhawk; and 18 inches in Coal Creek Canyon…Genesee…and 11 miles southwest of Morrison. Snowfall totaled 6.2 inches at the site of the former Stapleton International Airport. Precipitation (rain and melted snow) totaled 2.09 inches at Denver International Airport where north winds gusted to 30 mph on the 2nd.


In 1898…heavy snowfall of 6.2 inches fell over downtown Denver. Most of the snow melted as it fell. The greatest snow depth on the ground was 2.5 inches during the evening.

In 1907…the all-time lowest recorded temperature in the month of May…19 degrees…occurred.

In 1925…an apparent microburst produced sustained northeast winds to 44 mph with gusts to 52 mph. Rainfall was only 0.01 inch in downtown Denver.

In 1981…lightning struck 9 golfers at the south suburban golf course. None were injured seriously.

In 1983…hail 1 1/2 inches in diameter fell at Green Mountain west of Lakewood…with 3/4 inch stones reported in Lakewood.

In 1986…a thunderstorm wind gust to 51 mph was recorded at Stapleton International Airport.


In 1908…rain changed to snow on the evening of the 3rd and continued through the early evening of the 5th. Snowfall totaled 10.0 inches over downtown Denver. This was the last measurable snow of the season. Precipitation totaled 1.51 inches. North winds were sustained to 23 mph on the 3rd…33 mph on the 4th…and 21 mph on the 5th. Three temperature records were set. High temperatures of 30 degrees on the 4th and 38 degrees on the 5th were record low maximum temperatures for the dates. The reading on the 4th was also the all-time record low maximum for the month of May.

In 2007…a slow moving pacific storm system…from the desert southwest…brought a period of unsettled weather to the region. During the 3-day period…locally heavy snow was reported over parts of the Front Range foothills. Storm totals included: 15 inches near Conifer…14.5 inches west of Jamestown…13.5 inches; 6 miles southwest of Evergreen…and 12.5 inches at Pine Junction. Severe thunderstorms…producing large hail…up to one inch in diameter were observed in the vicinity of Boulder and Hudson. Lightning struck a residence in Jefferson County. The roof was hit…causing the attic to catch fire. At Denver International Airport…lightning struck a United Airlines jet as it was pushing away from the gate. The passengers were taken off the jet and put on another plane. » Click here to read the rest of April 30 to May 6: This week in Denver weather history

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Thornton’s weekend starts cool and breezy then warms up, calms down

Friday, April 28th, 2023 4:56am MDT

Not too bad of a three-day period ahead. Friday will be cool and offer some wind but after that, we warm up nicely for the rest of the weekend.

Look for partly sunny skies to be above today with breezy winds throughout the daytime and evening hours. High temperatures will top out in the upper 50s. Tonight, winds will settle down after dark. Lows will be in the mid-30s under partly clear skies.

Saturday sees the warmth return. Look for highs around 70 degrees under mostly sunny skies. Winds will be a bit breezy in the afternoon. Saturday night, partly clear skies will be above with lows dropping to around 40 degrees.

Sunday looks much like Saturday. Highs again will top out near 70 degrees under mostly sunny skies.

It should be a good weekend to get some of that springtime yardwork done.

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Thursday to offer up some sun and warmth but rain and possibly snow arrive tonight

Thursday, April 27th, 2023 4:48am MDT

A little bit of everything in today’s weather forecast for Thornton. Daytime hours will see some blue sky and mild temps but late in the day, another front moves in chilling us out and bringing precipitation.

Mostly sunny skies will be with us this morning then the afternoon will see cloud cover increase. In addition to the clouds, winds will become blustery this afternoon as the front approaches. Look for highs in the upper 60s. Late afternoon introduces a chance for a thunderstorm and then in the evening, light rain.

Overnight, temperatures will drop and when they do, we may see some snow after midnight into early tomorrow morning. Minimal, if any accumulations are expected. Lows will dip to around freezing.

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Rain to come to an end Wednesday morning, temps remain cool

Wednesday, April 26th, 2023 4:51am MDT

Not as big of a soaker as expected but we did receive a respectable amount of rain (0.38” as of 4:00am). Precipitation will be ending by mid-morning and then we will see some sun and cool temps.

We start out with cloudy skies and some light rain. There may be some snowflakes mixed in early but that is seeming more unlikely. After about 10:00am, rain will end and the skies will see some clearing. Highs will top out in the mid-50s.

Tonight, we will be dry and calm. Lows will be in the mid-30s under partly clear skies.

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Tuesday brings cool temps, a good shot of rain later

Tuesday, April 25th, 2023 4:57am MDT

The much talked about storm system is working its way closer, albeit with a more southern track than originally expected. Despite the change we still should receive a healthy shot of rain later today.

We start off with partly sunny to mostly cloudy skies for the morning. Cloud cover will then increase in the afternoon. Along with the clouds, upslope winds will increase as well. Highs today will top off in the mid-50s.

Some light rain showers / sprinkles will be possible through the morning although they aren’t expected to amount to much. The afternoon, after about 3:00pm, look for showers to increase, possibly with some thunder to be heard.

By about 5:00pm this evening, showers will be widespread and pretty consistent until after midnight. Showers will then continue through dawn tomorrow but ease up in intensity. In the end, we could see a half inch or more of liquid precipitation.

The early morning hours may see some snow mix in as temperatures drop but minimal, if any accumulation is expected. Overnight lows will be near freezing.

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

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Temps near normal, slight chance for a shower for Thornton’s Monday

Monday, April 24th, 2023 5:09am MDT

Today offers up the relative calm before tomorrow’s storm. Look for temperatures readings to be right near average for the date and the PM then brings a chance for showers.

Varying degrees of cloudiness will be seen but largely expect partly sunny to mostly cloudy skies above. High temperatures will top out near the average high for the date of 63 degrees. The afternoon may bring a sprinkle of rain but we aren’t expecting much for the period.

Tonight, light rain will be possible throughout. We will be under mostly cloudy skies and lows will be in the mid to upper 30s.

As for the much talked about storm system, it continues to be on track and set to arrive Tuesday PM. No real changes to the outlook from what we posted last night. The system has a bunch of moisture associated with it and as such, heavy precipitation is expected across the area from tomorrow afternoon through Wednesday morning.

The mountains and foothills will see big dose of snow. For us, at lower elevations, we continue to expect most of the precipitation to fall as rain with perhaps a little bit of snow (less than an inch) overnight tomorrow night.

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April 23 to April 29: This week in Denver weather history

Sunday, April 23rd, 2023 5:10am MDT

This Week in Denver Weather History

Certainly April can bring pleasant weather but it also can bring thunderstorms and even heavy, damaging snow as we see in our look back at this week in Denver weather history.

From the National Weather Service:


In 1989…unusually warm weather resulted in several daily temperature records being broken in Denver. The high temperature of 89 degrees on the 21st exceeded the record maximum for the month at that time. Daily record high temperatures were either exceeded or equaled with 83 degrees on the 20th…88 degrees on the 22nd…and 85 degrees on the 23rd. The low temperature of 55 degrees on the 22nd equaled the record high minimum for the date.


In 1999…a spring snowstorm dumped heavy snowfall over metro Denver and in the foothills. Nearly 3 feet of snow fell in the foothills with over a foot in the city. The heavy wet snow downed power lines in Douglas and Elbert counties. Scattered outages were reported at Parker…Franktown… Sedalia…and Castle Rock. Some residents were without electricity for as long as 20 hours. The inclement weather was blamed…at least in part…for several traffic accidents along the I-25 corridor between Denver and Castle Rock. Snowfall totals included: 32 inches at Idaho Springs; 31 inches on Crow Hill; 29 inches near Evergreen; 26 inches at Chief Hosa and Coal Creek Canyon; 25 inches at Bailey; 24 inches at Floyd Hill; 23 inches at conifer…Genesee…Golden Gate Canyon…North Turkey Creek…and Pine Junction; 13 inches at Broomfield and near Sedalia; 12 inches in Boulder; 11 inches at Louisville and Parker; and 9 inches at the site of the former Stapleton International Airport.

In 2004…heavy snow fell across metro Denver…when low level upslope conditions developed against the foothills and Palmer Divide. Snowfall totals included: 18 inches in the foothills southwest of Boulder…17 inches at Intercanyon and near Conifer…10 inches near Blackhawk and Parker…9 inches at Castle Rock and near Sedalia…7 inches in Centennial… Littleton…and near Lone Tree. Elsewhere across metro Denver…snowfall generally ranged from 2 to 5 inches. Snowfall was 4.7 inches at Denver Stapleton. Northwest winds gusted to 35 mph at Denver International Airport on the 21st.


In 1885…the worst snow storm since station records began in 1872 dumped a total of 24.0 inches of snowfall on the city. The 23.0 inches of snow recorded on the 22nd and 23rd was the greatest 24-hour snowfall ever recorded during the month of April. Streets were impassable…roofs caved in… Telegraph and telephone wires were downed…railroads were blocked and trains delayed…and most business came to a complete standstill. Estimated losses were reported to 50 thousand dollars. The total snowfall was partly estimated due to melting. Precipitation from the storm totaled 2.79 inches.

In 1915…post-frontal rain during the day and overnight totaled 2.00 inches. Most of the rain fell on the 22nd.

In 1945…6.7 inches of snow fell over downtown Denver. This was the third major snow in a little over 3 weeks…which made this month the 4th snowiest on record. Northeast winds were sustained to 25 mph and light hail fell on the 22nd.

In 2013…a spring storm brought heavy snow to the mountains… with period of moderate to heavy snow to portions of the Front Range Foothills and Urban Corridor. In the mountains and foothills…storm totals included: 18 inches at Niwot Ridge SNOTEL; 16.5 inches near Ward; 13 inches at Arapahoe Basin and Roach SNOTEL…12 inches near Blackhawk; 11.5 inches near Nederland; 11 inches near Allenspark and at Loveland Ski Area; 10 inches near Idaho Springs and Pinecliffe; with 9.5 inches and near Silverthorne. Along the Urban Corridor storm totals included: 7.5 inches near Morrison; 7 inches at the National Weather Service Office in Boulder and Niwot; 6.5 inches near Arapahoe Park and Superior; with 6 inches at Lafayette and Lakewood. At Denver International Airport…4.7 inches of new snowfall was observed.


In 2010…a potent spring storm brought heavy…wet snow to areas in and near the Front Range foothills and widespread rainfall across the adjacent plains. In the Front Range foothills and north-central mountains east of the Continental Divide…storm totals ranged from 15 to 30 inches. Storm totals included: 29.5 inches…3 miles southeast of Pinecliffe; 27 inches…8 miles northeast of four corners; 23 inches at Willow Creek; 22.5 inches… 13 miles northwest of Golden; 21 inches at Never Summer; 17 inches at Eldorado Springs; 16.5 inches…3 miles west of Jamestown. Denver International Airport reported just a trace of snowfall…but measured 2.01 inches of rainfall for the duration of the storm. In addition…a peak wind gust to 54 mph from the northwest was observed at the airport on the 23rd. » Click here to read the rest of April 23 to April 29: This week in Denver weather history

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Unsettled weather starts Thornton’s weekend, dries out and calms down at the end

Friday, April 21st, 2023 4:54am MDT

Not an ideal spring weekend for us unfortunately. A series of systems will see us chill out and bring some chances for snow late today and through tomorrow.

Sunday does, thankfully, rebound pretty nicely though. For today, we start out with some sun but cloud cover will be increasing. Highs will top out in the mid-50s. Breezy winds will develop in the late afternoon.

This evening, precipitation arrives, initially as rain then changing over to snow by sunset. Light snow will then be possible overnight. We may wake up to an inch or so of the white stuff on grassy areas Saturday morning. Lows tonight will be in the mid to upper 20s.

Saturday will be chilly and cloudy. Look for highs only in the mid-40s. Light rain and snow showers will be possible throughout the day. Saturday night, We see some chances for showers until about midnight, then it will begin to clear. Lows will be around 30 degrees.

Sunday sees some halfway decent springtime weather. Mostly sunny skies will be above with highs in the mid to upper 50s. Overall, conditions will be calm and dry. Have a great weekend!

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Cool and blustery weather conditions for Thornton’s Thursday

Thursday, April 20th, 2023 4:55am MDT

With temperatures a good bit below normal and some blustery winds, today’s weather won’t be particularly nice.

We start out with sunny skies but by mid-morning cloud cover will increase with the majority of the day seeing partly sunny skies. High temperatures will top out around 50 degrees, about 10 degrees below normal. Winds will be increasing in speed through the morning and be quite blustery through the afternoon and evening.

Tonight, winds will die down not long after sunset. Skies will begin to clear and lows will be in the mid to upper 20s.

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Wednesday in Thornton brings unsettled conditions, cooler temperatures

Wednesday, April 19th, 2023 4:56am MDT

A couple of fronts move through today changing things up from the recent warm weather. Temperatures will cool and we stand a bit of a chance to see a shower.

Partly sunny skies start us off then by mid to late morning cloud cover will increase. Winds will be breezy, particularly from mid-afternoon into tonight. High temperatures will top out in the mid-50s. The afternoon brings a chance for a light rain shower. At this time, it isn’t looking like much.

This evening, precipitation chances increase and we may see a few flakes of snow mix in after dark although no accumulation is expected. After midnight, skies will begin to clear and overnight lows will be around 30 degrees.

Our live radar will let you keep an eye out for any shower activity.

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