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Thornton, Colorado, USA
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April 7 to April 13: This Week in Denver Weather History

Wednesday, April 10th, 2019 5:40am MDT
This week in Denver weather history

April 7 to April 13: This Week in Denver Weather History

While the calendar may say spring, wintry weather can and often does appear and many times it has a big impact. We clearly see this in our look back at this week in weather history where wind and snow make many appearances.

From the National Weather Service:

4-7

In 1909…post-frontal rain changed to heavy snow on the afternoon of the 4th and continued through mid-morning of the 7th. Total snowfall was 18.7 inches…but most of the snow…14.0 inches…fell from 6:00 pm on the 4th to 6:00 pm on the 5th. North to northeast winds were sustained to 32 mph on the 4th and to 30 mph on the 7th. Total precipitation from the storm was 1.78 inches.

5-7

In 1916…rain changed to snow behind a cold front on the 5th and totaled 4.5 inches in the city. A thunderstorm produced snow on the 6th. North winds were sustained to 35 mph with gusts to 38 mph on the 7th.

6-7

In 1872…rain changed to snow overnight. Snow with high north winds continued all day on the 7th. Precipitation (rain and melted snow) totaled 0.50 inch. Due to problems on the lines…the morning weather report was not sent by telegraph until 3:10 pm and the midnight report was not sent at all.

In 1957…heavy snowfall totaled 6.6 inches at Stapleton Airport where north winds gusted to 46 mph. This was the second heavy snow event in less than 4 days.

In 1969…winds gusting as high as 50 to 60 mph caused only light damage along the eastern foothills. The strong winds contributed to the spread of a forest fire near Boulder. Sustained winds of 25 mph with gusts to 53 mph were recorded in Boulder. Southwest winds gusted to 38 mph on the 6th and 44 mph on the 7th at Stapleton International Airport.

In 1980…high winds howled along the foothills each day. A wind gust to 72 mph was recorded in Lakewood. The strong winds blew a camper top off a pickup truck in Denver. At Stapleton International Airport…west winds gusted to 41 mph on both days.

In 1998…a spring storm brought a mix of snow and thunder to metro Denver…the foothills…and Palmer Divide. Conifer and Elizabeth both measured 4 inches of new snow. On the 6th…only 0.1 inch of snow fell at the site of the former Stapleton International Airport where thunder was heard on both days. Precipitation totaled 0.60 inch at Denver International Airport where west winds gusted to 43 mph on the 6th.

6-8

In 1973…a major spring snow storm dumped 11.6 inches of snowfall over metro Denver. North wind gusts of 30 to 35 mph produced some blowing snow. Most of the heavy wet snow… 10.1 inches…fell on the 7th when temperatures remained in the 20’s. Snow accumulated on the ground to a maximum depth of 9 inches. Low temperature of 5 degrees on the 8th was a new record minimum for the date and the lowest for so late in the season.

7

In 1906…north winds were sustained to 48 mph in the city.

In 1958…strong south winds blew most of the day across metro Denver. A wind gust to 52 mph was recorded at Stapleton Airport.

In 1962…strong gusty winds associated with a cold front caused considerable damage to power lines…signs… Buildings…and trees across metro Denver. In Boulder…an outdoor movie screen…valued at 10 thousand dollars…was wrecked. In Denver…a youth was injured when a car was blown off a jack…pinning him underneath. Wind gusts to 61 mph were recorded at Stapleton Airport where visibility was reduced to 1/2 mile in blowing dust. Snowfall totaled 2.6 inches at Stapleton Airport.

In 1971…wind gusts to 69 mph were recorded at the National Bureau of Standards in Boulder. In downtown Boulder…winds peaked to 54 mph. West winds gusted to 31 mph at Stapleton International Airport.

In 1989…high winds occurred in the foothills west of Denver. At Nederland west of Boulder…high winds damaged roofs… Toppled trees…and caused power outages. Winds estimated as high as 90 mph in Georgetown overturned campers and even semi-trailers on I-70 and damaged road signs. Three trailer homes were blown off their foundations and a 50-foot tree toppled onto the roof of a home…causing considerable damage. Winds reached 94 mph at Rollinsville southwest of Boulder. Northwest winds gusted to 43 mph at Stapleton International Airport.

7-9

In 1913…heavy snowfall totaled 10.9 inches in downtown Denver behind a cold front. Most of the snow fell on the 8th. Northeast winds were sustained to 35 mph with gusts to 38 mph on the 9th.

In 1935…moderate dust blew into the city around 9:00 pm on the 7th and persisted until early afternoon on the 9th. Southeast winds were sustained to around 20 mph on the 7th and 8th. Winds shifting to the west at sustained speeds to 20 mph cleared the dust from the air on the 9th.

7-12

In 1959…snow falling over a 5-day period totaled 20 to 30 inches just east of the mountains…while over the plains blizzard conditions closed schools and blocked highways. The second big storm in two weeks dumped 16.4 inches of snowfall on Stapleton Airport with the most…11.6 inches… Occurring on the 8th. East winds gusted to 37 mph on the 9th. Temperatures dipped into the single digits on the mornings of the 7th and 12th when 7 degrees were registered. Low temperature records for the dates were set on the 9th…10th…and 12th. The cold temperatures caused streets to glaze with ice…resulting in the death of a pedestrian who was struck by a car in Denver. Three people died from heart attacks while shoveling the heavy… Wet snow.

» Click here to read the rest of April 7 to April 13: This Week in Denver Weather History

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Significant snowstorm barrels down on Thornton, conditions to deteriorate throughout the day

Wednesday, April 10th, 2019 5:05am MDT

From the warm yesterday to the storm today. We’ll be following yesterday’s summer-like weather with a winter storm that is going to have a significant impact with snow and wind by the end of the day today.

We start out with partly clear skies but cloud cover will be increasing quickly and we will be entirely cloudy by noon. Wind speeds will similarly be increasing through the morning and early afternoon. By this evenings, gusts in excess of 40 mph are expected.

A few light rain showers may be seen this morning to be followed by a quick transition to snow by about 2:00pm. Moderate snowfall will then be seen through about midnight before tapering off and ending tomorrow morning.

The timing of the snow and wind is going to likely lead to a messy PM commute and conditions soon after will become difficult. Areas to our east on the plains are going to be impacted more than us.

However, here in Thornton, we’ll still get our share of excitement. Look for 3 to 5 inches total accumulation. Should banding develop or this system sit over one spot longer than expected, those totals could go up considerably.

A Blizzard Warning will kick in at noon and run through noon tomorrow.

Our Winter Weather Briefing Page is your one stop shop for everything.

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Near record-setting warmth Tuesday in Thornton but winter weather returns Wednesday

Tuesday, April 9th, 2019 5:00am MDT

Springtime in Colorado can bring with it wildly varying #weather over a short period of time and such will be the case over the next 48 hours. Today we will see unseasonably warm temperatures while a Winter Storm Watch has been issued for the storm set to arrive tomorrow.

For today, partly sunny skies will be above throughout the day. Those clouds won’t do much to inhibit the temperatures with highs expected to be close to the 80 degree mark. The record high in Denver for today’s date is 81 degrees (1977) and we could beat that.

Tonight, mostly cloudy skies will be above with lows in the mid-40s.

The coming storm will arrive late tomorrow morning. Early on we could see a high near 50 but then temperatures will be downhill for the balance of the day.

Light rain will be possible in the morning becoming heavier after noon. A transition to snow will then occur as temperatures drop in the afternoon, potentially leading to a messy PM commute.

Moderate snowfall may then be seen from the evening until midnight before tapering off. Total accumulations for us could be in the 3 to 5 inch range. Coupled with the snow will be strong winds creating blowing snow and making it miserable outside.

As usual, what sort of snowfall and impact we realize from the storm will greatly depend on track and timing. A shift in the track or a later or earlier transition to snow could make a big difference.

The National Weather Service has issued a Winter Storm Watch that will be in effect from noon Wednesday to noon Thursday. Read the complete text of the watch here.

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Thornton’s workweek starts off unseasonably warm, cooler and wetter weather lie ahead

Monday, April 8th, 2019 5:04am MDT

We start off with dry conditions and temps much warmer than normal today and tomorrow. Wednesday, things turn colder and much more unsettled with even a couple chances of snow.

For today, look for mostly clear skies to be above with a few more clouds in the afternoon. High temperatures today will top out in the mid-70s, about 15 degrees above normal.

Tonight, we’ll have a good bit of cloud cover above with lows in the mid-40s.

Tuesday is going to be the warmest day of the week with mercury readings coming close to the record high of 81 degrees for the date.

Then, a relatively strong storm system arrives late Wednesday. Cooler temps, rain and perhaps snow Wednesday night will be on tap. Right now, it looks like the most significant impact will be to our east but this system will bear watching as it gets closer. Colder than normal temps will be on tap Thursday and Friday with another chance for snow Friday.

Get more details in the extended weather forecast here.

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Unseasonably warm temperatures, relatively calm conditions for Thornton’s weekend

Friday, April 5th, 2019 4:52am MDT

A pretty nice looking three-day period ahead for us. Temperatures will be mild and, for the most part, it will lack any drama.

For Friday, there is a good bit of moisture aloft so partly sunny skies will be above throughout the day. Temperatures will be quite mild with highs in the upper 60s. At this time, it looks like any shower activity will be south of us. Tonight, mostly cloudy skies will be above with lows in the low 40s.

Saturday, we will continue to have a good bit of cloud cover above. Highs will be in the mid-60s and we do have a chance to see some scattered rain showers in the afternoon into the evening. Saturday night into Sunday morning, lows will be near 40 degrees.

Sunday will see a healthy dose of sun with sunny to mostly sunny skies above. Highs will be in the mid-60s and we will be dry.

Have a great weekend!

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Unseasonably warm temperatures, a good dose of sun for Thursday

Thursday, April 4th, 2019 4:52am MDT

Thornton will enjoy a very nice spring day today. Temperatures will be above normal and we’ll couple that with mostly sunny skies for most of the day.

Mostly clear skies start us off then we see a bit of an increase in cloud cover by mid-day. By sunset, partly clear skies will be above. Temperatures will top out in the mid to upper 60s.

Tonight, skies will be mostly cloudy with lows in the low 40s.

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Thornton’s Wednesday to offer near normal temps, scattered PM thunderstorms and showers

Wednesday, April 3rd, 2019 5:20am MDT

Our weather today looks a good bit like yesterday. Temperatures will be similar with a good bit of cloud cover but we do see a bit better chance for some afternoon and evening precipitation.

Mostly cloudy skies start us off and will be with us throughout the day thanks to a good bit of mid-level moisture. Winds will be relatively light and out of the northeast. Temperatures will top out right near the 60 degree mark.

Some scattered shower and thunderstorm activity is expected this afternoon into the evening. Our best chances will come from about 3:00pm to 7:00pm. If we do see some activity, it isn’t expected to amount to much.

Tonight, cloud cover will gradually ease with overnight lows expected to drop to the mid-30s.

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Seasonal temperatures, a chance for a late day rain shower Tuesday

Tuesday, April 2nd, 2019 4:55am MDT

A weak disturbance will be moving through today serving up a good bit of cloud cover but temperatures will be staying near normal. There is a chance for us to see a rain shower this evening.

The day starts with mostly cloudy skies and similar coverage can be expected throughout the day. Winds will be light and out of the north then the northeast in the afternoon. Look for temperatures to top out today in the upper 50s.

This evening brings us a chance for a light rain shower, mainly from about 6:00pm to midnight.

Tonight, skies remain mostly cloudy with overnight lows in the upper 30s.

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

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March 2019 weather recap: Another cold, wet month in the books

Monday, April 1st, 2019 10:10am MDT

The unstable, cold and wet weather that marked February continued right on into March. Once again, we saw temperatures well below normal and a good bit more than average precipitation.

While the first day of the month started things off relatively nicely, the second brought the first bout of cold. Temperatures plummeted with highs on the third only in the single digits and nighttime low temperatures below zero on the 3rd and 4th. This was coupled with a nice shot of 3.4 inches of snow on the 3rd.

We then slowly warmed up and enjoyed near normal temperatures for a brief period of time. This changed quickly and significantly with the arrival of a blizzard on the 13th. Powerful winds coupled with snow shut down schools, businesses, highways and Denver International Airport.

Calmer, drier weather then took hold for much of the rest of the month although most days continued to see temperatures below normal. The 26th and 27th did offer up our first days of 70 degree or warmer temperatures.

The month closed out with another shot of cold on the 29th and 30th and a light bit of snow.

Thornton’s overall average temperature for the month of March was 35.1 degrees. Out at Denver International Airport here the Mile High City’s official measurements are taken, they matched our temperature with an average of 35.1 degrees as well. Both were well below the historical average March temperature for Denver of 40.4 degrees.

Temperatures in Thornton ranged from a maximum reading of 74.9 degrees on the 27th down to a low of -5.0 degrees on the morning of the 4th. Denver saw its maximum of 73 degrees on the 27th and its minimum of -6 degrees on the 3rd.

Denver set a record low maximum for March 3rd when the temperature only reached a high of 6 degrees. The old record was 14 degrees set in 1978. Additionally, a low temperature reading of -3 degrees on the 4th tied the record low for the date also set in 1960 and 1978.

In terms of precipitation, Thornton recorded 1.19 inches in our bucket while Denver bested us with 1.39 inches. Both were above the long term Denver average for the month of March of 0.92 inches.

Denver’s 0.64 inches of liquid precipitation on the 13th set a daily record, easily besting the old record of 0.43 inches (1926) for the date.

Denver averages 10.7 inches of snow during the month of March. Thornton and Denver beat the average with measurements of 12.2 inches and 12.9 inches respectively.

Click here to view Thornton’s March 2019 climate report.

Thornton, Colorado's March 2019 temperature summary. (ThorntonWeather.com)

Thornton, Colorado’s March 2019 temperature summary. (ThorntonWeather.com)

Thornton, Colorado's March 2019 precipitation summary. (ThorntonWeather.com)

Thornton, Colorado’s March 2019 precipitation summary. (ThorntonWeather.com)

CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
938 AM MDT MON APR 1 2019

...................................

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF MARCH 2019...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2019

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              84   03/26/1971
 LOW              -11   03/28/1886
HIGHEST            73   03/27                         73  03/22
LOWEST             -6   03/03                         13  03/07
AVG. MAXIMUM     46.7              54.4    -7.7     58.5
AVG. MINIMUM     23.5              26.4    -2.9     26.8
MEAN             35.1              40.4    -5.3     42.7
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      3               1.9     1.1        0
DAYS MIN <= 32     28              23.6     4.4       27
DAYS MIN <= 0       3               0.1     2.9        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.56   1983
 MINIMUM         0.03   2012
TOTALS           1.39              0.92    0.47     1.02
DAILY AVG.       0.04              0.03    0.01     0.03
DAYS >= .01         9               5.9     3.1        6
DAYS >= .10         6               2.4     3.6        3
DAYS >= .50         1               0.3     0.7        0
DAYS >= 1.00        0               0.1    -0.1        0
GREATEST
 24 HR. TOTAL    0.64   03/13 TO 03/13           03/18 TO 03/18

SNOWFALL (INCHES)
RECORDS
 TOTAL           12.9              10.7
RECORD MARCH     35.2    2003

DEGREE_DAYS
HEATING TOTAL     919               763     156      684
 SINCE 7/1       5336              5202     134     4741
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0

FREEZE DATES
RECORD
 EARLIEST     09/08/1962
 LATEST       06/08/2007
EARLIEST                        10/07
LATEST                          05/05
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              10.2
RESULTANT WIND SPEED/DIRECTION   1/060
HIGHEST WIND SPEED/DIRECTION    60/340    DATE  03/13
HIGHEST GUST SPEED/DIRECTION    80/340    DATE  03/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY         11

AVERAGE RH (PERCENT)     67

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.
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Thornton’s workweek starts with seasonal temperatures, calm conditions

Monday, April 1st, 2019 5:03am MDT

Monday will offer up some pretty nice weather for us. Temperatures will be right near normal with just a bit of cloud cover and some slightly breezy winds.

Clear skies start us off and then moisture aloft will increase bringing in some cloud cover for the balance of the day. Overall though, mostly sunny skies should be the rule.

Winds will be calm initially then become just a little bit breezy in the afternoon but nothing too strong or annoying. Highs today will top out right near the average high for today’s date of 58 degrees.

Tonight, mostly cloudy skies will be above with lows dropping close to freezing.

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