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Thornton, Colorado, USA
UpdatedSat, 03-Jun-2023 10:55pm MDT 
 

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Tuesday in Thornton offers another mild day, slight chance for a thunderstorm

Tuesday, May 9th, 2023 4:53am MDT

Another good-looking spring day ahead. Temperatures will be well above normal with just a slight chance to see an evening thunderstorm.

Mostly sunny skies will be above throughout the day. Overall conditions will be calm with some breezy winds in the afternoon and evening. High temperatures will top out in the mid to upper 70s.

This evening, after about 5:00pm, we stand a chance to see a thunderstorm develop. Best chances come before 9:00pm then things will settle down. Skies will be partly clear tonight with overnight lows around 50 degrees.

Do keep an eye on the weather tomorrow. As it looks right now, we will have our first chance of the season for severe thunderstorms on the Front Range.

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Mild temperatures, a chance for a shower start Thornton’s workweek

Monday, May 8th, 2023 4:49am MDT

We start off the new workweek with conditions much like we saw this past weekend. Temperatures will again be above normal and we have just a chance for a shower.

Mostly sunny skies start us off then we will see increased cloud cover in the afternoon. Overall, conditions will be calm aside from some slightly breezy PM winds. Highs will top out in the mid-70s. After 3:00pm, we have just a chance to see a shower but at this time, any precipitation that falls is expected to be light.

Tonight, shower chances will diminish and end by midnight. Skies will clear and lows will be in the mid-40s.

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May 7 to May 13: This week in Denver weather history

Sunday, May 7th, 2023 5:05am MDT

This Week in Denver Weather History

Think we are done with snow for the season? That may be the case this year but it isn’t always so. Looking back at this week in Denver history we do see snowfall has occurred along with more typical spring weather including heavy rains that led to flooding.

From the National Weather Service:

4-8

In 1969…heavy rains caused flooding on Boulder creek in Boulder…which resulted in one death on the 7th. Flooding also occurred on Bear Creek in Sheridan and on the South Platte River in Denver. Rain over most of the eastern foothills started late on the 4th and continued with only brief interruptions in many areas until the morning of the 8th. Very high rates of rainfall occurred on the 6th and 7th with the greatest intensities in a band along the foothills from about 25 miles southwest of Denver northward to Estes Park. Storm totals by both official and unofficial measurements exceeded 10 inches over much of this area and were over 12 inches in some localities. Heavy snow fell in the higher mountains and in the foothills later in the period. The saturation of the soil resulted in numerous rock and land slides…and the heavy run-off caused severe damage along many streams and flooding on the South Platte River. Many foothill communities were isolated as highways were blocked and communications disrupted. Roads were severely damaged over a wide area…and a large number of bridges washed out. Many roads were closed due to the danger from falling rocks. A building in Georgetown collapsed from the weight of heavy wet snow. In Boulder…a man drowned when caught by the flooding waters of Boulder Creek…and a patrolman was injured. Rainfall totaled 7.60 inches in Boulder with 9.34 inches recorded at the Public Service Company electric plant in Boulder Canyon. In Morrison…rainfall totaled 11.27 inches in 4 days. Heavy rainfall totaled 4.68 inches at Stapleton International Airport over 3 days from the 5th through the 7th. Rainfall of 3.14 inches was recorded in 24 hours on the 6th and 7th. Downstream flooding continued along the South Platte River until the 12th when the flood crest reached the Nebraska line.

6-7

In 1873…snowfall totaled 8.9 inches in downtown Denver. Most of the snow fell on the 6th.

7

In 1904…west winds were sustained to 48 mph with gusts to 60 mph. A shower produced 0.16 inch of rain.

In 1953…a microburst caused a brief wind gust to 58 mph at Stapleton Airport.

In 1958…3/4 inch diameter hail fell over south metro Denver… 10 miles southwest of Stapleton Airport.

In 1977…baseball size hail damaged windows in Wheat Ridge. Hail was 4 inches deep on the ground in Arvada. Hail 3/4 to 1 inch diameter fell in Westminster and Kittredge.

In 1990…a fast moving cold front produced wind gusts of 40 to 60 mph. Brighton reported a wind gust to 57 mph…while north wind gusts to 44 mph were measured at Stapleton International Airport.

In 1995…severe thunderstorms struck Aurora. Hail piled 4 to 5 inches deep in the vicinity of Quincy Reservoir in south Aurora. Lightning struck an Aurora police communications tower causing significant malfunction to the primary system. Minor damage was sustained when lightning struck an apartment building. Hail…up to 1 1/4 inches in diameter…while soft and slushy…accumulated up to 6 inches deep in 15 minutes. Many streets were closed for an hour or more due to flooding caused by heavy rain and melting hail stones. Some trees were stripped of their leaves. Hail as large as 1/2 inch diameter was measured at Denver International Airport where a funnel cloud was sighted.

In 2003…a tornado touched down briefly near Bennett…but did no reported damage.

In 2005…severe thunderstorms produced 3/4 inch hail near Brighton and a thunderstorm wind gust to 60 mph near Fort Lupton.

In 2014…Severe thunderstorms produced large hail, from 1 to 1 1/2 inches in diameter, across parts of Arvada, Broomfield, Dacono, Northglenn and Thornton.

In 2015…a severe thunderstorm produced hail…up to walnut size…in Elbert County. A weak tornado touched down briefly near Ft. Lupton.

In 2017…a 37-year-old woman and her horse were killed near Sedalia after lightning hit a nearby tree. A teenage girl was also seriously injured. Damaging microburst winds downed trees and power poles across parts of Adams…Arapahoe…Denver and Douglas Counties. Electrical lines and branches were also snapped causing scattered power outages.

7-8

In 1958…rainfall totaled 2.50 inches at Stapleton Airport. » Click here to read the rest of May 7 to May 13: This week in Denver weather history

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Thornton’s weekend to continue with the mild temps, offer up some breezy winds

Friday, May 5th, 2023 4:54am MDT

A pretty decent looking weekend of weather ahead for us. Temps will be above normal throughout along with lots of sun but there will be some slight chances for storms and some breezy winds.

For today, we start off the day sunny then will see some clouds this afternoon. Highs will top out in the mid to upper 70s. The afternoon brings just a slight chance for a thunderstorm. There will be some breezy winds from mid-afternoon through the evening. Tonight, the winds will settle down after about 9:00pm. Skies will then clear and lows will dip to around 40 degrees.

Saturday cools down slightly. Look for highs in the low 70s. Sunny skies will be above initially then mostly sunny in the afternoon. Winds will become breezy by late morning and continue through the evening. Saturday night, skies will be partly clear with lows around 40 degrees.

Sunday looks similar to the previous two days. Highs will be in the low 70s with mostly sunny skies above. The afternoon sees slight chances for thunderstorms and again, breezy winds. Have a great weekend!

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Mild temperatures continue Thursday but with showers & thunderstorms

Thursday, May 4th, 2023 4:51am MDT

While we will enjoy another mild day today, a weak disturbance will interrupt the calm. Showers and thunderstorms will be likely this afternoon although they aren’t expected to be very dramatic.

Partly clear skies start us off then coverage will increase with mostly cloudy skies for the balance of the day. Despite the clouds, high temperatures will still reach the low to mid-70s. After noon, showers are expected to develop, possibly with a bit of thunder thrown in the mix. At this time, rainfall looks to be relatively light but should be appreciable.

This evening, shower coverage will decrease, largely ending by about 9:00pm. Skies will then begin to clear and overnight lows will be in the mid-40s. Keep an eye out for the showers with our interactive radar here.

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Wednesday brings warm temps, calm conditions to Thornton

Wednesday, May 3rd, 2023 4:19am MDT

There is little to complain about in today’s weather forecast. We will enjoy temperatures well above normal and overall, calm conditions.

We start off with some clouds but look for the majority of the day to see mostly sunny skies. Some, slightly breezy winds will be possible in the late afternoon. Look for highs to push close to the 80 degree mark.

Tonight, it will remain calm. Lows will dip to around 50 degrees under mostly cloudy skies.

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Mild temperatures Tuesday, slight chance for a thunderstorm

Tuesday, May 2nd, 2023 4:49am MDT

Another good looking day ahead for Thornton. We once again will enjoy above normal temperatures although there is just a bit of a chance for a PM thunderstorm.

Mostly sunny skies start us off then we will see some increased cloud cover this morning. Highs will top out in the low to mid-70s. After about 3:00pm, we see just a slight chance for a thunderstorm.

This evening, chances for thunderstorms increase slightly as will the cloud cover. By midnight, any storms will be done. Overnight lows tonight will be in the mid to upper 40s.

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Thornton’s workweek starts off with mild temps, dry conditions

Monday, May 1st, 2023 4:51am MDT

This weekend’s mild, calm conditions are going to continue into today. We will see temps well above normal and remain dry.

We will start off the day clear then see some clouds during the daytime hours but remain mostly sunny. Overall, conditions will be calm and dry beyond some slightly breezy winds in the late afternoon and evening. High temperatures will top out in the mid-70s.

Tonight, skies will see some clearing then lows will be in the low to mid-40s.

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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:

29-30

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.

29-2

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.

30

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.

30-1

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.

1

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.

1-2

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.

1-5

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.

2

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.

2-3

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.

2-4

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.

2-5

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.

3

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.

3-5

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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