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Thornton, Colorado, USA
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Cold and wet Monday as Thornton gets its first wintry blast of the season

Monday, October 9th, 2017 5:07am MST

From sun and warmth the past two days to cold and snow today. The changeover to snow occurred later than expected and thus totals will not quite be what was expected but we will be very wet and quite cold.

As of this writing nearly a half inch of liquid precipitation has been received since the storm arrived yesterday evening, most of which fell as rain. Early this morning it has transitioned to snow and we are seeing some light, slushy accumulations. Roads are extraordinarily wet with all the water and some spots may become slick with the cold temperatures.

Look for the snow, with some rain at times, to continue through the morning hours before tapering off after noon. We could still see total accumulations of a couple of inches, primarily on grassy areas.

Temperatures will only reach highs in the mid-30s. A Winter Storm Warning remains in effect until 3:00pm although it will likely be dropped before that time.

Skies will begin clearing by the late afternoon / evening and by midnight be mostly clear. Lows tonight will be right near the freezing mark. A Freeze Warning remains in effect until 10:00am tomorrow.

Editor’s note: The image below has the correct forecast high temperature.  It should read 35 degrees.

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Breaking: Sunday remains warm but Winter Storm and Freeze Warnings issued for tonight & tomorrow

Sunday, October 8th, 2017 5:59am MST

Get out and enjoy that warm weather today because we are set to get a healthy dose of wintry weather tonight. The storm that we have been mentioning for days is closing in and warnings have been posted for very cold temperatures and decent snow accumulations.

For today, look for sunny skies to start things off then by mid to late morning a gradual increase in cloud cover will occur. Winds will be light through about mid-afternoon when we reach our high in the low to mid-70s.

After that, the front pushes through and wind speeds will being increasing and by this evening gusts in excess of 40mph will be possible. After about 6:00pm some light rain may be seen with better chances after 9:00pm.

The temperature will then be well on its way downward and a transition to snow looks to occur around 11:00pm or so. The snow is then expected to continue through tomorrow morning.

Total accumulations in our area could be on the order of 3 to 5 inches, some localized amounts may be higher. Certainly given how warm the ground is, some of what initially falls will simply melt off. Lows tonight will be right near the freezing mark.

The National Weather Service has issued a Freeze Warning that is in effect from midnight tonight to 10:00am Tuesday. Additionally, a Winter Storm Warning is in effect from midnight tonight to 3:00pm.

Use the warm weather today to ensure you, your home and your vehicles are prepared for this significant change in the weather.

Read the full text of the warnings here.

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A very mild Saturday for Thornton but a Winter Storm Watch is issued for Monday

Saturday, October 7th, 2017 6:29am MST

The next few days will feature the crazy swings in weather we can experience here in Thornton. We will enjoy unseasonably warm conditions today and tomorrow but tomorrow night a potent storm arrives and is expected to bring a decent accumulating snow event.

For today, look for sunny skies throughout the day. Temperatures will be warming to a high right near the 80 degree mark. Some gusty winds will be on tap for the afternoon, lasting into the early evening. Tonight the winds settle down, skies remain clear and lows will be in the mid-40s.

Tomorrow look for similarly sunny and dry conditions but it will be cooler with highs in the low 70s.

The storm moves through Sunday night and after midnight any precipitation is expected to change to snow. Assuming temperatures remain cold enough, snow will continue into late Monday morning. The National Weather Service has issued a Winter Storm Watch that will run from midnight Sunday night to 6:00pm Monday. Total accumulations of 4 to 6 inches will be possible although a good bit of that will likely melt on contact. Certainly you should be prepared for a potentially rough commute Monday AM. Our Winter Weather Briefing has the latest.

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Following an unsettled Friday, Thornton’s weekend to warm up, offer pleasant conditions

Friday, October 6th, 2017 5:24am MST

Not too bad of a looking three day period for us. Today will be a bit cool and possibly damp but after that we are going to enjoy a weekend with above normal temps and dry conditions. Then, well, things change considerably with snow being likely Sunday night into Monday.

For today some spots of fog may be seen early then we will have mostly cloudy skies above until the late afternoon / early evening when we should see some clearing. There will be some chances for sprinkles of rain throughout the day with the best opportunity coming in the afternoon. The afternoon will also offer up some breezy northwest winds. Highs today will be in the low to mid-60s.

Tonight look for skies to clear. Overnight lows will be in the mid-40s.

Saturday looks to be the nicest day of the period. Sunny skies will start things off and be with us throughout the day. We will remain dry and see calm conditions as we head for a high temperature around 80 degrees.

Saturday night into Sunday morning skies will be mostly clear with lows in the mid-40s.

The weekend closes out on Sunday with a nice day as well. Sunny skies will be above and while high temperatures will be a bit cooler, they will remain above normal.

The next storm system may begin to make itself felt as early as Sunday evening with a few rain showers being possible. Overnight Sunday night into Monday, if all goes as it looks now, that precipitation will change over to snow. We are still a good ways out from that and there is still uncertainty regarding the timing and speed, both of which will affect the impact of the system.

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September 2017 weather recap: Month starts warm and dry, ends cool and damp

Thursday, October 5th, 2017 12:57pm MST

The month of September 2017 saw significant differences between the start and the end.  The first two-thirds of the month were extraordinarily dry with temperatures well above normal. The last 10 days brought a big change though with damp conditions and much cooler conditions.

High pressure dominated the region for the first few weeks of the month.  During this period when we normally see cooler temperatures, we instead saw highs oftentimes at or above 90 degrees and a couple of record high readings.  Additionally, it was exceedingly dry with Thornton only received 0.03 inches of precipitation through the first 22 days of the month.

Big changes arrived and the last nine days of the month stood it stark contrast to the rest of September. Low pressure and a series of disturbances brought much cooler temperatures and much-needed precipitation, including snowfall in the high country. Seven out of the last eight days saw below normal high temperature readings and enough precipitation fell to push us to just above normal.

Thornton’s overall average temperature for the month came in at 62.4 degrees.  This was a full degree cooler than Denver’s long term September average of 63.4 degrees.  Out at DIA where Denver’s official measurements are taken, it was a good bit warmer with an average temperature of 65.1 degrees.

Temperatures in Thornton ranged from a high of 98.5 degrees on the third and a low of 40.9 degrees on the morning of the 29th.  Denver saw their high of 97 degrees on the third as well and their coldest reading of 40 degrees on the 20th.

Two record high temperatures were officially set or tied for the Mile High City.  The high temperature of 97 degrees on the third tied the record high for the date.  A reading of 92 degrees on the 21st set a new record high for that date.

In terms of precipitation, Denver averages 0.96 inches during September.  Thornton tallied 1.05 inches in the rain bucket while Denver bested us with 1.26 inches.

Click here to view Thornton’s September 2017 climate report.

Thornton, Colorado’s September 2017 Temperature Summary. (ThorntonWeather.com)

Thornton, Colorado’s September 2017 Temperature Summary. (ThorntonWeather.com)

Thornton, Colorado’s September 2017 Precipitation Summary. (ThorntonWeather.com)

Thornton, Colorado’s September 2017 Precipitation Summary. (ThorntonWeather.com)

From the National Weather Service:

CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
244 AM MDT SUN OCT 1 2017

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              97   09/03/2017
                        09/06/2013
                        09/05/2013
 LOW               17   09/29/1985
HIGHEST            97R  09/03        91       6       93  09/05
LOWEST             40   09/20        35       5       37  09/10
AVG. MAXIMUM     79.0              78.5     0.5     82.3
AVG. MINIMUM     51.3              48.3     3.0     49.7
MEAN             65.1              63.4     1.7     66.0
DAYS MAX >= 90      9               3.4     5.6        6
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.8    -0.8        0
DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 5.61 2013 MINIMUM T 1892 1944 TOTALS 1.26 0.96 0.30 0.28 DAILY AVG. 0.04 0.03 0.01 0.01 DAYS >= .01         6               6.5    -0.5        4
DAYS >= .10         2               3.3    -1.3        1
DAYS >= .50         1               0.6     0.4        0
DAYS >= 1.00        0               0.1    -0.1        0
GREATEST
 24 HR. TOTAL    0.83   09/23 TO 09/23           09/12 TO 09/12

SNOWFALL (INCHES)
RECORDS
 TOTAL             0.0
TOTALS            0.0               1.3

DEGREE_DAYS
HEATING TOTAL     122               125      -3       64
 SINCE 7/1        130               141     -11       79
COOLING TOTAL     131                76      55       99
 SINCE 1/1        880               764     116      861

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

WIND (MPH)
AVERAGE WIND SPEED              9.6
RESULTANT WIND SPEED/DIRECTION   2/165
HIGHEST WIND SPEED/DIRECTION    40/020    DATE  09/19
HIGHEST GUST SPEED/DIRECTION    48/030    DATE  09/19

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            9
NUMBER OF DAYS PC             15
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     48

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       1
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      1
HAZE                     10

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.
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Near normal temps, chance for PM storms for Thornton’s Thursday

Thursday, October 5th, 2017 5:31am MST

Following a foggy start, our day today looks to be a pretty decent one with largely seasonal temps and then a chance for storms. The main focus in our weather future though is a system set to arrive Monday that may bring our first accumulating snow of the season.

For today, areas of fog will be seen, dense in spots, and as such a Dense Fog Advisory is in effect until 9:00am. Be sure to be careful as you encounter these areas on the road. Not long after sunrise the fog will begin to burn off and we will see partly sunny skies for most of the morning. That will be followed by some easing of cover in the late morning / early afternoon then an increase again in the evening.

Temperatures today will be topping out in the mid to upper 60s. Late afternoon brings slight chances for some showers and thunderstorms with the best opportunity coming after 6:00pm.

Some shower activity may persist in the overnight hours. Look for nighttime lows tonight to dip to around 50 degrees.

Looking ahead, Friday will be cooler with chances for showers. Then we are set to enjoy a mild, dry weekend.

The biggest thing we are watching is a deep trough and associated cold front set to arrive sometime in the late Sunday / Monday timeframe. Models are in pretty good agreement on this system and should they hold true, it is likely we will see our first shot of snow for the season here along the Front Range.

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Thornton’s October weather preview: Fall arrives in earnest, tastes of winter

Wednesday, October 4th, 2017 5:07am MST

Thornton, Colorado October weather preview.With the first full month of fall here, October usually brings one of the quietest weather months in the Denver area with plenty of mild, sunny days and clear, cool nights.

October is historically the second sunniest month and conditions are generally calm.

However we also will usually see our first taste of winter during the month with the first freeze and first snowfall of the season.

Temperatures as well will start to drop and by the end of the month the average nighttime lows are below freezing.

For complete details on our historical October weather and what we can expect in the coming month, read our complete October weather preview here.

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Wednesday offers seasonal temperatures, slight chance for storms

Wednesday, October 4th, 2017 5:00am MST

A welcome bit of warmer temperatures on tap for Thornton today. Highs will be near normal and we see just a slight chance for a PM thunderstorm.

Partly cloudy skies start of the day and will be with us this morning. Late morning and early afternoon should bring a bit of clearing. We see just a slight chance for an isolated thunderstorm or two after about 3:00pm lasting into the evening. Highs today will top out in the upper 60s, close the average for the date of 70 degrees. Looks for skies to clear some tonight with overnight lows around 48 degrees.

Keep an eye out for any storms here.

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Cool but dry conditions for Thornton’s Tuesday

Tuesday, October 3rd, 2017 5:14am MST

Definitely a chill in the air to start the day today as we saw our first Frost Advisory of the season. We will warm up today but with temps remaining a good ways below normal.

Mostly sunny skies will be the general rule of thumb today with varying degrees of cloud coverage. We are starting out quite chilly and the Frost Advisory remains in effect until 9:00am. Look for the mercury to climb to a high in the mid to upper 50s. Overall conditions will be calm.

Tonight clouds will increase and we will see lows in the low to mid-40s.

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Thornton’s workweek starts with a return to cool, wet conditions

Monday, October 2nd, 2017 5:04am MST

This weekend brought us a break from the unsettled weather but that has ended and today we get right back to weather like we had much of last week.

The day starts off with cloudy skies and areas of light rain. Look for that to generally continue throughout the day and into the evening. The afternoon periods may see a bit of an increase in activity, perhaps with a bit of thunder to go with it.

Winds will become breezy in the afternoon and out of the north. Temperatures will be much cooler than normal today with highs around the 50 degree mark.

Look for the rain to end by around midnight tonight to be followed by some clearing. Overnight lows will be around 40 degrees.

Keep an eye on the showers with our interactive radar here.

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