Thornton, Colorado, USA
UpdatedMon, 23-Jan-2017 5:30am MST 


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Thornton’s October 2016 preview: Fall returns, hopefully with precipitation

Thursday, October 6th, 2016 6:20am 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. Given the lack of precipitation of the last few months though, we certainly would welcome some moisture.

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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September 2016 weather recap: A very dry month with near normal temperatures

Thursday, October 6th, 2016 6:00am MST

The month of September was overall a pleasant one however that came at a price.  A very distinct lack of precipitation led to dry conditions, a trend that had started earlier in the summer.

High pressure was the general rule for the month and that helped to ensure that any significant weather potential was steered away from the state.  A few troughs and cold fronts mixed things up but in the end, we only saw precipitation on three days during the month and the amounts were negligible.

Thornton’s average temperature for the month came in at 63.7 degrees.  This was just slightly above Denver’s long term average for September of 63.4 degrees.  Out at the airport where Denver’s official measurements are taken, it was a good bit warmer with an average of 66.0 degrees.

Temperatures here ranged from a high of 91.6 degrees on the 5th of the month down to a low of 39.8 degrees on the 24th.  DIA recorded a maximum of 93 degrees, also on the 5th, and a low of 37 degrees on the 10th.

In terms of precipitation, Thornton saw a measly 0.05 inches fall into our rain bucket.  The airport fared far better with 0.28 inches.  However, both measurements were well below the September average for Denver of 0.96 inches.  The reading in Thornton would have been low enough to tie for the third driest reading in Mile High City history.

Click here to view Thornton’s September 2016 climate report.

Thornton, Colorado's September 2016 temperature summary. (ThorntonWeather.com)

Thornton, Colorado’s September 2016 temperature summary. (ThorntonWeather.com)

Thornton, Colorado's September 2016 precipitation summary. (ThorntonWeather.com)

Thornton, Colorado’s September 2016 precipitation summary. (ThorntonWeather.com)

From the National Weather Service:

933 AM MDT SAT OCT 1 2016




                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
 HIGH              97   09/06/2013
 LOW               17   09/29/1985
HIGHEST            93   09/05        91       2       92  09/02
LOWEST             37   09/10        35       2       44  09/19
AVG. MAXIMUM     82.3              78.5     3.8     85.2
AVG. MINIMUM     49.7              48.3     1.4     53.5
MEAN             66.0              63.4     2.6     69.4
DAYS MAX >= 90      6               3.4     2.6        7
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 0.28 0.96 -0.68 0.11 DAILY AVG. 0.01 0.03 -0.02 0.00 DAYS >= .01         4               6.5    -2.5        3
DAYS >= .10         1               3.3    -2.3        0
DAYS >= .50         0               0.6    -0.6        0
DAYS >= 1.00        0               0.1    -0.1        0
 24 HR. TOTAL    0.18   09/12 TO 09/12           08/31 TO 09/01

 TOTAL            0.0              1.3
RECORD SEPTEMBER 17.2                      1971

HEATING TOTAL      64               125     -61        9
 SINCE 7/1         79               141     -62       27
COOLING TOTAL      99                76      23      148
 SINCE 1/1        861               764      97      861

 EARLIEST     09/08/1962
 LATEST       06/08/2007
EARLIEST                        10/07
LATEST                          05/05

AVERAGE WIND SPEED              9.5

AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           13
NUMBER OF DAYS PC             13


THUNDERSTORM              6     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                6     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       4     FOG W/VIS <= 1/4 MILE      3
HAZE                      4

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Cool, damp weather for Thornton’s Thursday, freezing temps possible tonight

Thursday, October 6th, 2016 5:14am MST

A definite taste of fall weather is in store for us today as we cool considerably and expect to see a touch of precipitation. The system will move out quickly though leading to cold temperatures tonight and another Freeze Warning.

We start out the day under cloudy skies to be followed by some, limited clearing as the day progresses. Light showers and sprinkles are being seen in spots now and those will continue intermittently through the morning then taper off in the afternoon. Unfortunately we don’t expect a lot of precipitation out of this.

Temperatures today are going to be quite a bit cooler than recent days with highs topping out in the low to mid-50s. Tonight we will see skies clear and, if there is no wind, temperatures will drop to near freezing.

A Freeze Warning has been issued and will be in effect from midnight to 9:00am Friday so be sure to cover up or bring inside any sensitive plants. More details on the warning can be found here.

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Florida braces for Hurricane Matthew as track swings closer

Thursday, October 6th, 2016 2:02am MST

MIAMI — Hurricane Matthew, a lethal storm already blamed for 11 deaths, delivered a sobering wake-up call to Florida on Wednesday: a hurricane warning up and down the Atlantic Coast that shuttered schools, triggered mandatory evacuations and put billions of dollars of property at risk. Tracking on a course that leaned closer and closer to Florida,… » Click here to read the rest of Florida braces for Hurricane Matthew as track swings closer

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Following a chilly start, Thornton to warm up nicely Wednesday

Wednesday, October 5th, 2016 5:08am MST

There is definitely a bite of cold in the air this morning as we saw temperatures dip to near freezing bringing our coldest reading in five months. The chill will fade with the rising sun though as we head toward temperatures near normal today.

We start out with clear skies to be followed by a few clouds as the day progresses. Winds are going to be generally calm throughout. Temperatures will be warming up nicely to right near the average high for the date of 70 degrees.

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Looking beyond, a cold front will be moving in tonight and that will bring us a chance for showers overnight and through tomorrow. Unfortunately it does not look like any precipitation that falls will amount to much and we do not expect there to be snow in our area. Tomorrow’s will be a good bit cooler topping out in the mid-50s. We will then rebound nicely with warmer readings through the weekend.

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Tuesday’s weather brings cooler temps, less wind

Tuesday, October 4th, 2016 5:04am MST

While yesterday was mild, that wind howled pretty good, particularly after dark. Today we see the winds die down and temperatures cool quite a bit following the passage of the front.

We’ll start out the day with mostly clear skies then see a few more clouds as the morning progresses. The coverage won’t be dominating though and mostly sunny skies will be the rule.

Winds are going to be lighter and out of the southwest shifting to the northwest in the afternoon. In terms of temperatures, look for highs to top out in the mid to upper 60s, a bit below average for the date.

Looking ahead, tomorrow looks to be a near clone of today with a good bit of sun and similar temperatures. We continue to watch a second trough coupled with a cold front set to arrive Wednesday night into Thursday. Right now it looks like any precipitation in our area will be rain but we can’t entirely rule out a touch of snow either.

In the wake of the system, overnight lows Thursday night could dip to below freezing so you may want to start making plans to cover up or bring in any sensitive plants. Friday will remain cool but dry and calm then we start to rebound nicely for what should be a mild, calm weekend.

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September 2016 top shots: Monthly photo slideshow

Monday, October 3rd, 2016 8:37pm MST
An absolutely gorgeous mountain scene as pictured from Long Draw Road. (Ashlea Beers)

An absolutely gorgeous mountain scene as pictured from Long Draw Road. (Ashlea Beers)

The month of September is typically one of the more pleasant months in Colorado.  Temperatures are usually comfortable and there is not normally a lot of weather drama.  That however does not mean there aren’t plenty of photo opportunities.

Wildlife is still quite active along the Front Range and flowers will hold on to their petals for at least the first part of the month.  Then of course there is the weather which you never know what to expect.  Thunderstorms, heavy rain, and even snow are a possibility.

  • Slideshow updated October 4, 2016
  • 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.

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!

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Dry, warm & breezy for Thornton’s Monday, balance of week to be cooler

Monday, October 3rd, 2016 5:15am MST

Thornton starts out the week with a mild day and one that brings high fire danger. That changes tomorrow as a series of troughs will move through during the rest of the week bringing cooler temperatures and the possibility of our first freeze and snow.

For today mostly to partly sunny skies will be above. Temperatures will be climbing to highs right near the 80 degree mark, maybe a couple of degrees higher than that.

Winds will be increasing in speed with gusts in the 25 to 30 mph range being possible this afternoon and evening. The wind coupled with low humidity and dry fuels on the ground have caused a Red Flag Warning to be issued and in effect from noon to 7:00pm. Please be careful!

Looking ahead, the first trough moves in tonight with a second one to follow Thursday. These will lead to temperatures a bit below normal Tuesday and Wednesday. Then the second, coupled with a cold front, will bring much colder temperatures Thursday. We will stand a chance to see our first freeze and perhaps our first snow Thursday morning.

Get more details in our extended forecast.

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October 2 to October 8: This Week in Denver Weather History

Sunday, October 2nd, 2016 6:02am MST
This Week In Denver Weather History

October 2 to October 8: This Week in Denver Weather History

October is usually a relatively calm weather month in Denver but can see some interesting events. In our look back at this week in Denver weather history we see tornadoes, damaging wind and of course snow.

From the National Weather Service:


In 1903…southwest winds were sustained to 42 mph with gusts as high as 60 mph. The strong Chinook winds warmed the temperature to a high of 78 degrees.

In 1910…an apparent dry microburst produced sustained northeast winds to 43 mph.

In 1934…a trace of rain was the only precipitation of the month. This was the driest October on record.


In 1875…very dense haze hid the mountains from view as observed from the city.

In 1933…rainfall of just 0.01 inch was the only precipitation of the month. This was the second driest October on record.

In 1954…the low temperature cooled to only 60 degrees…the all-time record high minimum for the month October.


In 1969…the first snowfall of the season totaled 16.0 inches at Stapleton International Airport. There was a thunder snow shower on the evening of the 3rd…but otherwise little wind with the storm. The greatest snow depth on the ground was 8 inches due to melting. Heavy wet snow accumulated on trees…which were still in full leaf…and caused widespread damage from broken limbs and downed utility lines.


In 1984…the remnants of pacific hurricane Polo produced heavy rain over northeastern Colorado. Most locations received between 1.00 to 2.50 inches of rain…but 3.45 inches fell in Littleton. Rainfall totaled 1.73 inches at Stapleton International Airport…where north winds gusted to 24 mph.


In 1912…sustained south winds to 55 mph with gusts to 60 mph raised the temperature to a high of 83 degrees… The warmest temperature of the month that year.

In 1924…west winds were sustained to 46 mph with gusts to 50 mph in the city. The apparent Bora winds cooled the temperature to a high of 57 degrees from a high of 70 degrees on the 3rd.

In 2004…several small tornadoes touched down near Brighton… Barr lake…and Hudson in Adams and southern Weld counties. Most of these caused no damage. However…a small tornado 5 miles southeast of Brighton caused extensive damage to a recreational vehicle and severely damaged a barn. The barn was torn from its foundation…and the roof was thrown 100 feet. Four llamas in the barn were injured when it collapsed.


In 1997…unusually warm weather resulted in two temperature records. High temperature of 87 degrees on the 4th exceeded the old record set in 1922 by one degree. High temperature of 86 degrees on the 5th equaled the record set in 1990 and previous years.


In 1962…unusually severe thunderstorms for this late in the season affected areas from Boulder northward. Hail up to golf ball size and strong gusty winds did much damage to roofs…windows…and signs in Boulder. Heavy rainfall caused local flooding.

In 1994…lightning caused a power outage to over 2400 homes for a few hours in and around Nederland in the foothills southwest of Boulder. Very strong winds accompanied the thunderstorm. Thunderstorm winds gusted to 60 mph and hail to 1/2 inch diameter fell in Lafayette. Strong microburst winds gusting to 69 mph near Strasburg caused an oil rig to topple onto two vehicles…injuring one person. The strong winds in the area also downed a few power poles… But caused power outages to only a few homes.

In 1995…strong winds spread from the foothills onto the plains. Wind gusts to 77 mph were reported atop Squaw Mountain west of Denver. On the plains…winds gusted to 60 mph at Kennesburg and to 62 mph near Strasburg. North winds gusted to 41 mph at Denver International Airport.

» Click here to read the rest of October 2 to October 8: This Week in Denver Weather History

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Thornton’s weekend to bring slightly cooler temps, slight chances for storms

Friday, September 30th, 2016 5:13am MST

Just a little bit of a change in the weather pattern of recent days. Moisture moving in from the south is going to bring increased cloud cover leading to slightly cooler temperatures and offer just a slight chance for storms during the first part of the three-day period.

For Friday the moisture will give us mostly cloudy skies for most of the day. That will help to hold temperatures down to the mid to upper 80s; still above normal but cooler than the past few. This afternoon some isolated showers and thunderstorms will develop along the Front Range bringing us just a slight chance for precipitation.

Tomorrow the moisture begins to work its way out and that will lead to mostly sunny skies. Mercury readings will be similar to today and the afternoon brings just a slight chance for storm activity.

We close out the weekend on Sunday with a very mild, calm day. Temperatures will again be topping out close to the 80 degree mark.

Have a great weekend!

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