Category Archives: Thornton Weather

Image of the Day: Earth’s atmosphere and moon

NASA’s Earth Observatory releases some of the most stunning views of the planet taken by satellites and astronauts.  It’s ‘Image of the Day’ today is a stunning one showing the Earth’s atmosphere with a crescent moon hovering above.

Taken by astronauts aboard the International Space Station (ISS) on July 31, 2011, the image clearly shows the layers of our life giving atmosphere.  The moon appears extraordinarily close thanks to the camera’s perspective.

Astronauts aboard the International Space Station captured this stunning image of the atmosphere and the moon. (NASA)
Astronauts aboard the International Space Station captured this stunning image of the atmosphere and the moon. (NASA)

From NASA:

The limb of the Earth is a work of awesome beauty and a gift to science. When observed from space, the palette of gaseous layers of atmosphere reminds us of the fragility and tenuousness of the cocoon that shelters life from cold, harsh space. That same view also allows scientists to detect the gases and particles that make up our the different layers of our atmosphere. Astronauts aboard the International Space Station captured a bit of both in this digital photograph from July 31, 2011. They threw in the Moon as an extra gift.

Closest to Earth’s surface, the orange-red glow reveals Earth’s troposphere—the lowest, densest layer of the atmosphere, and the one we live within. A brown transitional layer is the upper edge of the troposphere, known as the tropopause. A milky white and gray layer sits above that, likely a slice of the stratosphere with perhaps some noctilucent clouds thrown in. The upper reaches of the atmosphere—the mesosphere, thermosphere, and exosphere—fade from shades of blue to the blackness of space.

The different colors occur because the dominant gases and particles in each layer act like prisms filtering out certain colors of light. Instruments carried on satellites and on craft such as the space shuttle have allowed scientists to decipher characteristics of the ozone layer and the climate-altering effects of aerosols.

A thin crescent of the Moon is illuminated by the Sun below the horizon of the Earth. Though the Moon is more than 384,400 kilometers (238,855 miles) away, the perspective from the camera makes it appear to be a part of our atmosphere.

Astronaut photograph ISS028-E-020072 was acquired on July 31, 2011, with a Nikon D3S digital camera using a 400 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center. The image was taken by the Expedition 28 crew. The image has been cropped and enhanced to improve contrast. Lens artifacts have been removed. The International Space Station Program supports the laboratory as part of the ISS National Lab to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public, and to make those images freely available on the Internet. Additional images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth. Caption by Mike Carlowicz.

A look ahead at Thornton’s December weather

Thornton's December Weather Preview
December ranks as Denver's coldest and third snowiest month.

As with any month in the Denver area, December can bring a variety of conditions. Certainly we have seen bitter cold and heavy snow but in other years dry and mild conditions prevailed.

Based on the updated 1981 to 2010 averages from the National Weather Service, the month is actually our coldest of the year. It also is our third snowiest behind March and November.

Winter weather is typically what we think of when we think about December and it is indeed prone to winter extremes.

In fact, our coldest month in Denver history was in December 1983.  In terms of snow, our snowiest month ever occurred in December 1913.  More recently the Christmas Eve Blizzard of 1982 and the storms on December 2006 invoke snow-filled memories.

You can read much more about our historical December weather as well as get a preview of what we can expect in 2012 here in our complete story.

Remember, when the snow starts flying, stay up to date with ThorntonWeather.com: ‘Like’ us on Facebook, follow us on Twitter and add us to your Google+ circles

October 2011 Thornton weather recap: Month finishes warmer, snowier and wetter than normal

October offered a bit of everything for everyone from record warmth to heavy snowfall.
October offered a bit of everything for everyone from record warmth to heavy snowfall.

October 2011 started out quite warm but then stabilized into a seasonal pattern.  As is often the case with Colorado weather though, at one point we went from record high temperatures to snow in a span of two days.

In terms of temperature, Denver finished the month with an overall overage temperature of 52.6 degrees.  This was 1.6 degrees above the normal for the month of 50.9 degrees.  Temperatures ranged from a high of 87 degrees on the first of the month down to 14 degrees on the 26th and 27th.

Here in Thornton we were slightly cooler with an average temperature of 50.4 degrees.  Our highs ranged from a top mark of 86.6 degrees on the first down to a very cold 12.8 degrees on the 27th.

Two record high temperatures were tied or broken during the month.  On the 15th, the mercury climbed to 82 degrees which tied the record for the date last set in 1938.  On the 24th the temperature hit 80 degrees, breaking the previous record high for the date of 79.

Quite a bit more precipitation was recorded than normal during October 2011.  1.79 inches fell into the rain bucket at DIA which is 0.82 inch above normal.  Much of that precipitation fell on October 8th when 1.04 inches was recorded, a record for the date.  DIA also recorded a trace of snowfall, the first of the season.

The Mile High City was hit with its first snowstorm on the 25th and 26th when 8.5 inches of the white stuff fell.  That also was the snowfall total for the month which far exceeded the normal of 4.2 inches.

Thornton nearly mirrored Denver’s precipitation as we recorded 1.75 inches during the month between rain and snowmelt.  Our snowfall fell short of DIAs however as we recorded 6.6 inches during the storm late in the month.

Click here to view Thornton’s climate summary for October 2011.

From the National Weather Service:

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2011... 

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2011

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            87   10/01        90      -3       85  10/03
LOWEST             14   10/26        -2      16       20  10/28
                        10/27
AVG. MAXIMUM     67.3              65.3     2.0     69.7
AVG. MINIMUM     37.9              36.6     1.3     40.9
MEAN             52.6              50.9     1.7     55.3
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX = .01         4               5.3    -1.3        4
DAYS >= .10         3               2.4     0.6        2
DAYS >= .50         1               0.5     0.5        0
DAYS >= 1.00        1               0.1     0.9        0
GREATEST
 24 HR. TOTAL    1.04   10/08 TO 10/08

SNOWFALL (INCHES)
RECORDS
 TOTAL           31.2   1969
TOTALS            8.5                4.2

DEGREE_DAYS
HEATING TOTAL     400               438     -38      300
 SINCE 7/1        495               576     -81      335
COOLING TOTAL      23                 5      18        8
 SINCE 1/1        964               769     195      870

FREEZE DATES
RECORD
 EARLIEST     09/08/1962
 LATEST       06/08/2007
EARLIEST      10/17             10/07
LATEST                          05/05
................................................... 

WIND (MPH)
AVERAGE WIND SPEED              9.8
RESULTANT WIND SPEED/DIRECTION   4/205
HIGHEST WIND SPEED/DIRECTION    49/210    DATE  10/06
HIGHEST GUST SPEED/DIRECTION    63/200    DATE  10/06

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           13
NUMBER OF DAYS PC             15
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     44

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                5     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       2
LIGHT SNOW                3     SLEET                      0
FOG                       5     FOG W/VIS

Thornton gets second snowstorm in a week

ThorntonWeather.com's east camera captured the storm at its height early Tuesday morning.
ThorntonWeather.com's east camera captured the storm at its height early Tuesday morning.

After weeks of what some would call boring weather, Thornton saw things change considerably over the past week.  Not one, but two snowstorms have hit the city getting us 2/3 of the way to the snow total we had for all of last season.

Here in Thornton we measured 6.6 inches with last week’s snowstorm and today’s added 7.9 inches.  That brings us to a seasonal total of 14.5 inches.

For comparison, the last season was absolutely dismal and we only received 21.2 inches over the entire period.  On average Denver receives 61.7 inches during a season.

The most recent storm prompted Winter Storm Warnings as the snow fell quickly after dark and lasted into the morning. The ground was much colder this time and aided by wind, it accumulated on roads unlike last week’s storm which saw the snow melt as quick as it fell.

While the morning commute was a mess and slow moving, it was relatively uneventful.  Much to the chagrin of local students, most school districts remained open for the day.  The sun started making an appearance after noon and by the evening a good bit of blue sky was above.

Below are time lapse videos taken from our two webcams of the storm.  They cover the 18 hour period from 6:00pm on November 1 to 12:00pm on November 2.

 

Thornton’s November weather preview – Our second snowiest and least sunny month

A look ahead at Thornton's November weather.Typically November is a quiet weather month with plenty of nice, fall days but it can also turn wet with plenty of snow and moisture.  Just like Forest Gump’s proverbial box of chocolates, you never quite know what you are going to get.

Looking into the weather history books, we see that November is actually Denver’s second snowiest month, second only to March (April is third).  Historically we average 10.7 inches of snow during the month.

One little known fact…  November is the area’s least sunny month, tying with May with only 64 percent sunshine.  September is the sunniest month with sunshine 74 percent of the time.

Get all the details on Denver’s November weather including a look back through history, a recap of last year and the statistics in our November weather preview.

City of Thornton offers residents winter weather preparedness tips

The City of Thornton wants residents to be prepared for the coming cold weather.
The City of Thornton wants residents to be prepared for the coming cold weather.

As we have been covering all week, by the governor’s declaration this is Winter Weather Preparedness Week in Colorado.  The City of Thornton has gotten on board with information to help the city’s residents prepare themselves for the coming season.

Thornton has become much more ‘weather aware’ in recent years and we applaud them for that.  Weather has a direct impact on everyone’s lives, too often with deadly effects, and it is important that people are aware of the dangers it presents.

The new page on the city’s website provides some great resources for residents.  On the page you will find information from the National Weather Service, a great document prepared by the Thornton Fire Department about winter safety and information about the city’s snow removal plan.

We do have to make note of a couple of things on the page.

First, there is no link to ThorntonWeather.com.  We are not affiliated with the city in any way however we are the only source of truly local weather news and information.  The city must be careful of who they put out there as a recommended resource but ThorntonWeather.com is well-established having been around for more than five years and being well known and highly regarded in the community.  We pride ourselves on the wealth of information we provide, an amount that far surpasses any other.

Second, it is somewhat ironic that one of the links provided on the city’s page is for Emergency Alert Information from the Colorado Division of Emergency Management.  This is a great resource page but as we have pointed out repeatedly, neither the city nor Adams County has any sort of emergency alert system.  This is a serious deficiency that the city has chosen not to address at this time.


Thornton goes from record high temps to heavy snow in a few short days

Denver saw a big change in the weather in a very short period of time.
Denver saw a big change in the weather in a very short period of time. Click the image for a slideshow of images from the snowstorm.

The weather in Colorado is famously variable and in a span of a few short days this was fully evident.  We went from record high temperatures to a winter-like snowstorm and back to sunny skies in four days.

On Monday, October24, Denver set a record high temperature of 80 degrees, besting the record high for the date of 79 degrees last set in 1999.  Thornton was just a touch cooler for the day with a high of 79 degrees.

Tuesday was a day of transition as we started with sunny skies but clouds rolled in during the afternoon and rain was falling by the evening.  As darkness descended and temperatures fell, the rain changed to snow and we started our first snowstorm of the season.

In the Denver metro area, snow totals ranged from a few inches to as many as 9 in the western and northwestern suburbs. Denver International Airport recorded 8.5 inches, more than double the 4.1 inch average for the month of October.  Here in Thornton, we lagged a bit with 6.6 inches of the white stuff.

Across Thornton and much of the Front Range, the heavy wet snow caused its share of problems.  Many trees had yet to lose their leaves and branches broke under the weight of the snow.  Power outages were seen across the region including many in Thornton.

The majority of Xcel Energy customers should have power restored tonight with some having to wait till tomorrow afternoon.  Click here for the Xcel Energy power outage map.

As the storm settled in, five participants at the sparsely occupied Occupy Denver protest suffered hypothermia according to organizers.  Denver Police continue to arrest those that defy the law against camping in Civic Center Park and adjacent areas.

Slideshow - Snowstorm covers Denver in blanket of white. (Examiner.com)While the storm moved out before nightfall Wednesday, it left clearing skies which led to bitterly cold temperatures.  Denver International Airport recorded an early morning low of 14 degrees, the coldest temperature the city has seen since March 5th. Here in Thornton we dropped to a low of 12.8 degrees.

The latest forecasts show we are in for a gradual warm up but one that will keep temperatures below normal through the weekend.  Beyond that, we may be getting our next shot of snow as soon as late in the day next Tuesday.

The video below was captured by our west facing webcam.  You can see as the snow builds the trees start sagging and struggle under the weight of the snow.

NOAA releases winter outlook: La Niña’s return could mean another dry winter in Thornton

Winter weather outlook
What will this winter hold for Thornton?

Strengthening La Niña conditions in the Pacific could lead to another dry winter on the Colorado Front Range according to the winter 2011 / 2012 outlook released by NOAA.  However, as we well know, Mother Nature is never consistent and other factors could give us some help.

Last year a relatively strong La Niña made ski areas in Colorado very happy while at lower elevations we were bone dry.  The high country saw record-setting amounts of snowfall but Denver endured its second least-snowiest season on record.

While temperatures in the Equatorial Pacific Ocean are indeed cooler than normal – and getting cooler – at this point they remain warmer than they were last year at this same time.  This does help us hold out some hope that the winter won’t be as dry as last year.

It should also be noted that the effects of La Niña and El Niño in Colorado are much harder to predict and less consistent than in other places in the nation.  Our location near the middle of the country with the monstrous Rocky Mountains adjacent to us oftentimes throws a wrench in the works.

From NOAA:

U.S. dealt another La Niña winter but ‘wild card’ could trump it
Devastating drought in Southern Plains likely to continue

NOAA's winter 2011 temperature outlook.
NOAA's winter 2011 temperature outlook. Click the image for a larger view.

The Southern Plains should prepare for continued drier and warmer than average weather, while the Pacific Northwest is likely to be colder and wetter than average from December through February, according to the annual Winter Outlook released today by NOAA.

For the second winter in a row, La Niña will influence weather patterns across the country, but as usual, it’s not the only climate factor at play. The ‘wild card’ is the lesser-known and less predictable Arctic Oscillation that could produce dramatic short-term swings in temperatures this winter.

NOAA expects La Niña, which returned in August, to gradually strengthen and continue through the upcoming winter. It is associated with cooler than normal water temperatures in the tropical Pacific Ocean and influences weather throughout the world.

“The evolving La Niña will shape this winter,” said Mike Halpert, deputy director of NOAA’s Climate Prediction Center. “There is a wild card, though. The erratic Arctic Oscillation can generate strong shifts in the climate patterns that could overwhelm or amplify La Niña’s typical impacts.”

The Arctic Oscillation is always present and fluctuates between positive and negative phases. The negative phase of the Arctic Oscillation pushes cold air into the U.S. from Canada. The Arctic Oscillation went strongly negative at times the last two winters, causing outbreaks of cold and snowy conditions in the U.S. such as the “Snowmaggedon” storm of 2009.  Strong Arctic Oscillation episodes typically last a few weeks and are difficult to predict more than one to two weeks in advance.

NOAA's winter 2011 precipitation outlook.
NOAA's winter 2011 precipitation outlook. Click the image for a larger view.

With La Niña in place Texas, Oklahoma, New Mexico and parts of surrounding states are unlikely to get enough rain to alleviate the ongoing drought. Texas, the epicenter of the drought, experienced its driest 12-month period on record from October 2010 through September 2011.

Stormy periods can occur anytime during the winter season. To improve the ability to predict and track winter storms, NOAA implemented a more accurate weather forecast model on Oct.18.  Data gathered from the model will support local weather forecast office efforts to prepare for and protect the public from weather events. This service is helping the country to become a Weather-Ready Nation at a time when extreme weather is on the rise.

According to the U.S. Winter Outlook (December through February) odds tilt in favor of:

  • Pacific Northwest:  colder and wetter than average. La Niña often results in below-average temperatures and increased mountain snow in the Pacific Northwest and western Montana during the winter months. This may set the stage for spring flooding in the Missouri River Basin;
  • California: colder than average and wetter than average conditions in northern California and drier than average conditions in southern California.  All of the southern part of the nation are at risk of having above normal wildfire conditions starting this winter and lasting into the spring;
  • Northern Plains: colder and wetter than average.  Spring flooding could be a concern in parts of this region;
  • Southern Plains and Gulf Coast States: warmer and drier than average. This will likely exacerbate drought conditions in these regions;
  • Florida and south Atlantic Coast: drier than average, with an equal chance for above-, near-, or below-normal temperatures. Above normal wildfire conditions;
  • Ohio and Tennessee Valleys: wetter than average with equal chances for above-, near-, or below-average temperatures. Potential for increased storminess and flooding;
  • Northeast and Mid-Atlantic: equal chances for above-, near-, or below-normal temperatures and precipitation. Winter weather for these regions is often driven not by La Niña but by the Arctic Oscillation. If enough cold air and moisture are in place, areas north of the Ohio Valley and into the Northeast could see above-average snow;
  • Great Lakes: colder and wetter than average;
  • Hawaii: above-average temperatures in the western islands with above normal precipitation during the winter.  Some drought recovery is expected across the state with Kauai and Oahu having the best potential for full recovery.
  • Alaska: colder than average over the southern half of the state and the panhandle with below average precipitation in the interior eastern part of the state.

This seasonal outlook does not project where and when snowstorms may hit or provide total seasonal snowfall accumulations. Snow forecasts are dependent upon winter storms, which are generally not predictable more than a week in advance.

August 2011 weather recap – An extraordinarily hot and dry August

August 2011 brought record-setting heat to Denver.

You didn’t need to know the statistics to be well aware that August was unusually warm and dry in Thornton and Denver.  The month saw little precipitation and record setting temperatures became commonplace, particularly in the latter half of the month.

For moisture, Denver recorded a mere 0.30 inch in the rain bucket at Denver International Airport.  This was 1.27 inches below the normal of 1.57 inches.  The month barely missed making the list of top 10 driest Augusts by only 0.02 inch.

Afternoon thunderstorms were seen 12 times at DIA but only one brought measurable precipitation.  The storms were typically high-based and yielded little more than wind.

Thornton followed DIA’s lead with little precipitation as we only saw 0.27 inch during the month.

Temperatures were the real weather story for August 2011 as rather than seeing cooler temperatures through the month like normal, the mercury stayed exceedingly high.

Overall DIA saw an average temperature of 77.0 degrees making it the hottest August on record.  This surpassed the previous record August from 1937 when 76.8 degrees was seen.  The month also went into the record books as the sixth warmest month ever recorded in Denver.

Temperatures ranged from a high of 99 degrees on the 25th down to a low of 55 degrees on the 20th.  Through August 31st, Denver had seen 71 consecutive days of 80 degrees or warmer weather.  This easily bested the previous longest streak of 59 days set in 2002.

Seven individual temperature records were set during the month.  These included a tied record high on the 18th of 98 degrees last set in 1986; the 23rd tied the record high of 98; the 24th set a new record high for the date of 98 degrees; the 25th set a new record high of 99 degrees; the 28th set a record high of 96 degrees; the 28th saw a record high minimum of 67 degrees; the 31st tied the record high of 98 degrees.

Here in Thornton we were certainly hot but not nearly as much so as DIA.  We recorded an average temperature of 74 degrees.  Our warmest reading was 96.2 degrees and our coolest was 54.  In all we saw 20 days with temperatures of 90 degrees or warmer.

While the high temperatures were notable, DIA benefits from later arrival of the typical afternoon thunderstorms due to its location further east of the rest of Denver.  This certainly aided in the airport recording higher temperatures than anywhere else in the metro area.  For more on that story, check out the Denver Weather Examiner.

Below are the official Denver weather statistics for August 2011.  Click here to view Thornton’s August 2011 climate summary.

CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE BOULDER, CO
430 PM MDT FRI SEP 2 2011

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2011...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2011

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR'S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             105   08/08/1878
 LOW               40   08/26/1910
                        08/25/1910
                        08/24/1910
HIGHEST            99   08/25       105      -6       97  08/22
LOWEST             55   08/20        40      15       47  08/17
AVG. MAXIMUM     92.7              87.2     5.5     88.6
AVG. MINIMUM     61.3              57.9     3.4     59.0
MEAN             77.0              72.5     4.5     73.8
DAYS MAX >= 90     22              11.5    10.5       12
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0
PRECIPITATION (INCHES)
RECORD 
 MAXIMUM         5.85   1979  
 MINIMUM         0.02   1924
TOTALS           0.30              1.57   -1.27     1.05
DAILY AVG.       0.01              0.05   -0.04     0.03
DAYS >= .01         3               8.6    -5.6        6
DAYS >= .10         1               4.3    -3.3        3
DAYS >= .50         0               1.2    -1.2        1
DAYS >= 1.00        0               0.3    -0.3        0
GREATEST
 24 HR. TOTAL    0.27   08/03 TO 08/03   0.68  08/01/10 TO 08/01/10
SNOWFALL (INCHES)
RECORDS
 TOTAL            0.0   NO SNOW EVER RECORDED IN AUGUST
TOTALS            0.0   NO SNOW EVER RECORDED IN AUGUST         

DEGREE_DAYS
HEATING TOTAL       0                 5      -5        0
 SINCE 7/1          0                11     -11        3
COOLING TOTAL     382               244     138      280
 SINCE 1/1        863               688     175      762              

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

WIND (MPH)
AVERAGE WIND SPEED              8.8
RESULTANT WIND SPEED/DIRECTION   3/202
HIGHEST WIND SPEED/DIRECTION    39/180  DATE  08/31  38/190 08/12
HIGHEST GUST SPEED/DIRECTION    48/200  DATE  08/31  45/340 08/12
                                                            08/16
SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM (NO LONGER RECORDED)
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             26
NUMBER OF DAYS CLOUDY          1

AVERAGE RH (PERCENT)     41

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       1
LIGHT RAIN                8     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      1
HAZE                      5                                           

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

Denver sees hottest August on record; 10 weather records tied or broken during hot month

August 2011 goes into the record books as the hottest August ever.
August 2011 goes into the record books as the hottest August ever.

As August 2011 came to a close and the numbers were crunched, they revealed what we already knew – it was one hot month!  In fact, in the final tally Denver tied or set 10 different records during the month.

From the National Weather Service, here is the list of records:

Denver’s record setting August 2011 – From the National Weather Service:

  1. August 2011 hottest Denver August with average temperature 77.0 degrees.  Previous record 76.8 degrees set in 1937.
  2. August 2011 became the 6th hottest Denver month.  Hottest was 77.8 during July 1934.
  3. 71 consecutive days above 80 degrees through August 31st.  Previous streak record 59 days set in 2002.
  4. Tied most August 90 degree days with 22.  Tied with 1995 and 1960.
  5. 18th – tied record high 98 last 1986
  6. 23rd – tied record high 98 last 2009
  7. 24th – record high 98 old 97 in 1936
  8. 25th – record high 99 old 96 in 1913
  9. 28th – record high 96 old 94 last 1969
  10. 28th – record high minimum temperature 67 old 66 last 2010
  11. 31st – tied record high 98 last 1960

How did Thornton compare?

Here in Thornton we were a bit cooler than what Denver’s official measurements at DIA recorded.  This is in large part due to our location further to the west.

When the typical afternoon cloud cover and thunderstorms develop in the summer, it can take more than an hour for those conditions to reach DIA.  As a result the station gets the benefit of a longer period of daytime heating. This works in Thornton’s favor as we stay a bit cooler.

For us, our overall average temperature for the month was 74.0 degrees – a full three degrees cooler than DIA.  That doesn’t mean it wasn’t hot for us as we recorded 20 days with 90 degree or hotter weather and every day saw 80 degrees or higher.

Are the Denver weather records really valid? Check out the stories from Examiner.com below for why they may not be.

  • Temperature records crumble; August on pace to be one of warmest on record
  • The fallacy of Denver’s climate records: Weather station move skews data
  • Do Denver weather and climate records have an asterisk attached?
  • Data shows Denver weather records skewed by move to DIA
  • Does it matter if Denver weather and climate records are skewed?