Category Archives: Thornton Weather

Astronomical winter arrives Friday, offers the shortest day of the year

The Winter Solstice
Winter officially begins at 9:28am MST on Thursday, December 21, 2017. (NOAA)

Astronomical winter arrives in Thornton Friday afternoon and with the solstice also comes the shortest day of the year.

Winter officially begins at 3:23pm MST on Friday, December 21.

The Winter Solstice occurs when the North Pole is tilted at its furthest from the sun – 23.5 degrees away. This results in the shortest day of the year in the Northern Hemisphere.

Here in Denver, with sunrise at 7:17am and sunset at 4:38pm, our day Friday will be 9 hours, 21 minutes and 16 seconds long.

The following day, Saturday, it will be one second longer and each day from now through to the Summer Solstice in June will get gradually longer as well.

While we have a short day today, it is nothing like what will be experienced in the Arctic Circle.  Areas north of there to the North Pole will have no direct sunlight at all.  Conversely, areas south of the Antarctic Circle toward the South Pole will have 24 hours of daylight and have a midnight sun.

Did you know that there is a difference between the astronomical seasons that we are discussing here and meteorological seasons?

Meteorological seasons differ slightly and are geared toward matching the calendar with the annual temperature cycle. This is done primarily for meteorological observing and forecasting and in many ways it is more logical than the astronomical seasons.

For the Northern Hemisphere, the meteorological spring covers the months of March, April and May. Summer brings the hottest months of the year and so meteorological summer is June, July and August. Meteorological fall then is September, October and November followed by the coldest months of December, January and February as meteorological winter.

November 2018 weather recap: Chilly temps, not much moisture

Thornton’s month of November saw us get a real taste of what is to come for the next few months. Temperatures cooled considerably and we saw a decent bit of snow although not as much as normal.

The first five days of the month started out relatively mild but then we saw a series of systems interrupt the calm.  Temperatures turned colder and on the 11th and 12th we received a nice little snowfall. We briefly warmed up then saw some light rain on the 18th and 19th and then once again warmed back up. The month closed out with a chilly day and some light snow.

Thornton saw an overall average temperature for the month of 36.8 degrees. This was a good bit colder than Denver’s long term average for the month of 38.3 degrees. Out at DIA where Denver’s official measurements are taken, it was a good bit warmer with an average of 37.8 degrees.

Temperatures for us ranged from a high of 64.7 degrees on the 2nd of the month down to a cold low of 15.7 degrees on the morning of the 26th.  Denver’s high of 65 degrees on the 2nd matched ours but their coldest reading of 10 on the 12th was notably colder than our lowest reading.

November’s long term precipitation average in Denver is 0.61 inches.  Thornton managed about half that in our bucket with 0.31 inches with Denver close to us at 0.35 inches.

Snowfall was respectable but not notable. Thornton recorded 6.3 inches of the white stuff while Denver, as usual, lagged with 4.5 inches. Both measurements were below Denver’s long term November average of 8.7 inches.

Click here to view Thornton’s November 2018 climate report.

Thornton, Colorado's November 2018 temperature summary. (ThorntonWeather.com)
Thornton, Colorado’s November 2018 temperature summary. (ThorntonWeather.com)
Thornton, Colorado's November 2018 precipitation summary. (ThorntonWeather.com)
Thornton, Colorado’s November 2018 precipitation summary. (ThorntonWeather.com)
CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
929 AM MST MON DEC 3 2018

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF NOVEMBER 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              81   11/27/2017
 LOW              -18   11/29/1877
HIGHEST            65   11/02        73      -8       81  11/27
LOWEST             10   11/12        -6      16       22  11/15
                                                          11/12
AVG. MAXIMUM     50.6              52.1    -1.5     61.1
AVG. MINIMUM     25.0              24.5     0.5     29.4
MEAN             37.8              38.3    -0.5     45.3
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      2               2.3    -0.3        0
DAYS MIN <= 32     27              23.4     3.6       22
DAYS MIN <= 0       0               0.6    -0.6        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.21   1946
 MINIMUM            T   1899
                        1901
                        1949
TOTALS           0.35              0.61   -0.26     0.29
DAILY AVG.       0.01              0.02   -0.01     0.01
DAYS >= .01         6               4.7     1.3        3
DAYS >= .10         1               1.6    -0.6        1
DAYS >= .50         0               0.0     0.0        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.17   11/11 TO 11/11           11/17 TO 11/17

SNOWFALL (INCHES)
RECORDS
TOTAL             4.5               8.7
RECORD NOVEMBER  42.5  1946

DEGREE_DAYS
HEATING TOTAL     808               801       7      586
 SINCE 7/1       1373              1382      -9     1171
COOLING TOTAL       0                 0       0        0
 SINCE 1/1       1026               769     257      881

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

WIND (MPH)
AVERAGE WIND SPEED              9.8
RESULTANT WIND SPEED/DIRECTION   2/225
HIGHEST WIND SPEED/DIRECTION    48/330    DATE  11/24
HIGHEST GUST SPEED/DIRECTION    62/320    DATE  11/24

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            8
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     56

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORMS             0      MIXED PRECIP       0
HEAVY RAIN                0      RAIN               0
LIGHT RAIN                2      FREEZING RAIN      0
LIGHT FREEZING RAIN       1      HAIL               0
HEAVY SNOW                0      SNOW               3
LIGHT SNOW                9      SLEET              0
FOG                       8      DENSE FOG          2
HAZE                      2

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

Thornton’s December weather preview: Will the chilly weather continue?

November brought Thornton cooler than normal temperatures and a bit more snow than usual.  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.

  • Stay up to date with Thornton’s weather: Be sure to ‘like’ us on Facebook, follow us on Twitter and add us to your Google+ circles.

November 2018 top shots: Monthly photo slideshow

Cool clouds over Thornton on an unsettled day. (LE Worley)
Cool clouds over Thornton on an unsettled day. (LE Worley)

Typically November is a quiet weather month with plenty of nice, fall days but it can also turn wet with healthy doses of snow and moisture.  The wide variety of conditions can create picturesque scenes ranging from blue skies and snow-capped mountains to a wintry wonderland in the metro area.

November is the second snowiest month of the year so winter conditions are not unusual.  Typically though, these bouts of cold are short-lived and normal daytime conditions are pleasant.

Outdoor activities continue to be quite popular during the month.  The cooling temperatures do oftentimes lead to an increase in wildlife activity.

All of the above help lead to a month in which a wide variety of scenes, flora and fauna can be captured.

  • Slideshow updated November 28, 2018
  • To learn more about how to send your photo to us for inclusion in the slideshow, see below the slideshow.

Showcasing images captured by ThorntonWeather.com readers as well as some of our own, our monthly slideshow covers the entire gamut of weather-related imagery.

Sunsets, sunrises, wildlife and of course every type of weather condition are vividly depicted in images captured from yours and our cameras.

[flickr_set id=”72157699958645692″]

What is missing in the slideshow above?  Your photo!

Our monthly photo slideshow is going to feature images that we have taken but more importantly images that you have captured.  The photos can be of anything even remotely weather-related.

Landscapes, current conditions, wildlife, pets, kids.  Whimsical, newsy, artsy.  Taken at the zoo, some other area attraction, a local park, a national park or your backyard.  You name it, we want to see and share it!

Images can be taken in Thornton, Denver or anywhere across the extraordinary Centennial State.  We’ll even take some from out of state if we can tie it to Colorado somehow.

We’ll keep the criteria very open to interpretation with just about any image eligible to be shown in our slideshows.

What do you win for having your image in our slideshow?  We are just a ‘mom and pop’ outfit and make no money from our site so we really don’t have the means to provide prizes.  However you will have our undying gratitude and the satisfaction that your images are shared on the most popular website in Thornton.

To share you images with us and get them included in the slideshow just email them to us or share them with ThorntonWeather.com on any of the various social media outlets.  Links are provided below.

So come on, get those camera’s rolling!

Weather Geek Stuff offers everything for the weather enthusiast on your holiday shopping list

Weather Geek Stuff is a great place to shop for gifts for weather enthusiasts, weather geeks and weather lovers.
Weather Geek Stuff is a great place to shop for gifts for weather enthusiasts, weather geeks and weather lovers.

Not everyone gets excited about blizzards, tornadoes, hurricanes and other types of extreme weather but many folks out there are passionate about Mother Nature.  Weather Geek Stuff is an online shop just for those whose hearts race with the thrill of severe weather and they are offering special deals through the holiday season.

Weather Geek Stuff is an online store that provides a host of clothing items and novelties just for weather buffs.  From the store’s custom ‘Weather Geek’ and ‘Weather Diva’ logoed merchandise to items imprinted with amusing weather warnings signs as well as Skywarn storm spotter logos, there is something there sure to please any weather lover.

Weather Geek Stuff’s merchandise was shown on the Weather Channel as a recommended gift so you know the quality is good.  Stu Ostro, Weather Channel’s Senior Director of Weather Communications even sports a ‘Weather Geek’ t-shirt on his Twitter profile.

Kids and dogs aren’t left out of the weather fun either.  There is a wide variety of clothing items sized just right for the little ones from babies to bigger kids.  Canine companions as well can get shirts and bowls emblazoned with a weather-related logo.

The selection goes far beyond clothing too.  Water bottles, clocks, mugs, bags and other novelties are part of the store’s offerings.  For the tech types, cases for iPhones and iPads are available.  Recently added products include laptop skins, clipboards and throw blankets.

Be sure to head over to WeatherGeekStuff.com and get that holiday gift today for your favorite weather geek. 

Support ThorntonWeather .com

Weather Geek Stuff is owned and operated by the same folks that run ThorntonWeather.com.  We provide ThorntonWeather.com as a no-cost service to the community and use the minimal amount of money made from Weather Geek Stuff to support the costs of running this website and the associated equipment.  So remember, if you have a weather buff on your shopping list, by buying from Weather Geek Stuff you are supporting ThorntonWeather.com!  You can also donate directly to fund the site here.

October 2018 weather recap: Cooler than normal temps, near normal precipitation

Fall arrived in earnest during the month of October 2018 as temperatures cooled considerably and we saw our first snowfall of the season.

The first two weeks of the month were notable for seeing 12 of 17 days with below normal temperatures. Five days in a row with measurable rain came from the 4th to the 9th and then on the 14th we saw that first snowfall.

The latter half of the month warmed up with above normal mercury readings being seen on all but the last two days of the October.  That same stretch of mild days also was one in which we saw no precipitation.

While the overall warm end of the month helped, we still saw overall monthly temperature readings well below normal.

Thornton’s average monthly temperature came in at 47.0 degrees. This is in comparison to Denver’s long term October average of 50.9 degrees, a near 4 degree difference.  Out at Denver International Airport where the Mile High City’s official readings are taken, it was a bit warmer with an average for the month of 49.2 degrees.

Here, we ranged from a high of 85.7 degrees on the 3rd down to a low of 18.1 degrees on the morning of the 15th. Denver saw a max of 86 degrees and a low of 18 degrees, each on the same days as our max and min.

Denver set two temperature records during the month.  The high temperature of only 27 degrees on the 14th set a new record low maximum for the date. This easily bested the old record of 36 degrees set in 1969. A record low temperature reading of 18 degrees on the 15th topped the previous record low for the date of 20 degrees set in 1970.

In terms of precipitation, Thornton recorded 1.01 inches between rain and snow melt.  Denver was very similar with a total of 0.99 inches.  Both measurements were close to the long term Denver average of 1.02 inches for the month.

Thornton saw a relatively minimal 2.8 inches of snowfall, all on the 14th. Denver recorded a bit more of the white stuff with 3.2 inches. Both were short of the October average of 4.0 inches.

Click here to view Thornton’s October 2018 climate report.

Thornton, Colorado's October 2018 temperature summary. (ThorntonWeather.com)
Thornton, Colorado’s October 2018 temperature summary. (ThorntonWeather.com)
Thornton, Colorado's October 2018 precipitation summary. (ThorntonWeather.com)
Thornton, Colorado’s October 2018 precipitation summary. (ThorntonWeather.com)
...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              90   10/01/1892
 LOW               -2   10/29/1917
HIGHEST            86   10/03        83       3       84  10/25
LOWEST             18   10/15        22      -4       13  10/27
AVG. MAXIMUM     61.6              65.3    -3.7     64.5
AVG. MINIMUM     36.8              36.6     0.2     35.7
MEAN             49.2              50.9    -1.7     50.1
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      1               0.4     0.6        0
DAYS MIN <= 32      7               8.5    -1.5       11
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.17   1969
 MINIMUM            T   1934
TOTALS           0.99              1.02   -0.03     0.96
DAILY AVG.       0.03              0.03    0.00     0.03
DAYS >= .01         9               5.3     3.7        5
DAYS >= .10         3               2.4     0.6        4
DAYS >= .50         0               0.5    -0.5        0
DAYS >= 1.00        0               0.1    -0.1        0
GREATEST
 24 HR. TOTAL    0.31   10/07 TO 10/07           10/09 TO 10/09

SNOWFALL (INCHES)
RECORDS
TOTAL             3.2               4.0
RECORD NOVEMBER  38.9  1969

DEGREE_DAYS
HEATING TOTAL     487               440      47      455
 SINCE 7/1        565               581     -16      585
COOLING TOTAL       4                 5      -1        1
 SINCE 1/1       1026               769     257      881

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

WIND (MPH)
AVERAGE WIND SPEED              9.7
RESULTANT WIND SPEED/DIRECTION   2/186
HIGHEST WIND SPEED/DIRECTION    39/360    DATE  10/29
HIGHEST GUST SPEED/DIRECTION    49/360    DATE  10/29

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY          8

AVERAGE RH (PERCENT)     59

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORMS             5      MIXED PRECIP       2
HEAVY RAIN                0      RAIN               3
LIGHT RAIN               12      FREEZING RAIN      0
LIGHT FREEZING RAIN       0      HAIL               0
HEAVY SNOW                0      SNOW               3
LIGHT SNOW                6      SLEET              0
FOG                      11      DENSE FOG          4
HAZE                      2

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

Thornton’s November weather preview: A month with widely varying weather

Thornton's November weather previewThe weather during the month of November in Denver metro area can offer just about anything.  While it is normally a quiet month, it can be prone to extremes.

November has historically been one of Denver’s snowiest months and major snowstorms are not entirely uncommon.  However conditions can also be quite dry.

Temperatures during the month continue to cool as we get closer to winter and by the end of the month the low temperatures routinely dip to 20 degrees or below.  At times it can in fact bring conditions more like what we see in January.

Get all the details on November’s weather and what we can expect in our complete preview here.

October 2018 top shots: Monthly photo slideshow

A gorgeous sunrise as seen at the Rocky Mountain Arsenal kicks off the second day of the month. (Bill Hutchinson)
A gorgeous sunrise as seen at the Rocky Mountain Arsenal kicks off the second day of the month. (Bill Hutchinson)

October in Thornton can bring a wide variety of weather conditions, perfect for the photographer in all of us.

The month brings the changing of the colors at Colorado’s lower elevations and it is also is typically when we see our first freeze and first snow.

Couple those facts with our usual widely varying landscapes and wildlife and we have a month that is sure to bring in plenty of photo opportunities.

  • Slideshow updated October 31, 2018
  • To learn more about how to send your photo to us for inclusion in the slideshow, see below the slideshow.

Showcasing images captured by ThorntonWeather.com readers as well as some of our own, our monthly slideshow covers the entire gamut of weather-related imagery.

Sunsets, sunrises, wildlife and of course every type of weather condition are vividly depicted in images captured from yours and our cameras.

[flickr_set id=”72157702277411875″]

What is missing in the slideshow above?  Your photo!

Our monthly photo slideshow is going to feature images that we have taken but more importantly images that you have captured.  The photos can be of anything even remotely weather-related.

Landscapes, current conditions, wildlife, pets, kids.  Whimsical, newsy, artsy.  Taken at the zoo, some other area attraction, a local park, a national park or your backyard.  You name it, we want to see and share it!

Images can be taken in Thornton, Denver or anywhere across the extraordinary Centennial State.  We’ll even take some from out of state if we can tie it to Colorado somehow.

We’ll keep the criteria very open to interpretation with just about any image eligible to be shown in our slideshows.

What do you win for having your image in our slideshow?  We are just a ‘mom and pop’ outfit and make no money from our site so we really don’t have the means to provide prizes.  However you will have our undying gratitude and the satisfaction that your images are shared on the most popular website in Thornton.

To share you images with us and get them included in the slideshow just email them to us or share them with ThorntonWeather.com on any of the various social media outlets.  Links are provided below.

So come on, get those camera’s rolling!

Denver sets record low temperature for October 15

Record Cold TemperaturesWe are set to enjoy a warm up this week but before we do that, Denver set its second record cold temperature reading in the past 24 hours.

Yesterday the Mile High City saw a record low maximum temperature. This morning, the mercury plunged to a new record low for the date.

According to the National Weather Service, Denver’s official low temperature this morning, as measured at Denver International Airport, dipped to 18 degrees.  This set a new record low for the date beating the previous record of 20 degrees set in 1970.

Here in Thornton, we matched the DIA number with a low of 18 degrees coming at 3:19am.

  • Don’t miss a thing when it comes to our ever-changing weather! Be sure to ‘like’ us on Facebook, follow us on Twitter and add us to your Google+ circles.

Denver sets new record low maximum temperature for October 14

Record Cold TemperaturesThe potent storm system that impacted us Saturday night through Sunday brought some snow but the most notable feature was the cold.  In fact, it was record setting.

The National Weather Service reports that the high temperature for Sunday, October 14 was only 27 degrees.  This absolutely destroys the old record low maximum for the date of 36 degrees set in 1969.

Here in Thornton, we saw our high reading just a touch warmer at 28 degrees.

Monday morning will see the temperature plunge and likely bring a record setting low as well.  After that, we do expect to see a gradual warming trend through the coming weekend.

  • Don’t miss a thing when it comes to our ever-changing weather! Be sure to ‘like’ us on Facebook, follow us on Twitter and add us to your Google+ circles.