WFO Denver/Boulder

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1035 PM MDT FRI SEP 23 2011

             A PREVIEW OF DENVER'S OCTOBER WEATHER
   ...OCTOBER IS THE FIRST FULL MONTH OF THE FALL SEASON...

OCTOBER IS NORMALLY ONE OF THE QUIETEST WEATHER MONTHS IN DENVER WITH AN
ABUNDANCE OF MILD SUNNY DAYS AND CLEAR COOL NIGHTS. IT HAS THE SECOND
HIGHEST AMOUNT OF SUNSHINE WITH 72 PERCENT.  THE MONTH WITH THE HIGHEST
PERCENTAGE IS SEPTEMBER WITH 74 PERCENT AND COINCIDENTLY THE MONTH AFTER
OCTOBER...NOVEMBER IS ONE OF THE LOWEST SUNSHINE MONTHS WITH ONLY 64
PERCENT. IN MOST YEARS... OCTOBER BRINGS THE FIRST TASTE OF WINTER WITH THE
AVERAGE DATE OF THE FIRST FREEZE ON THE 7TH AND AVERAGE FIRST SNOW ON THE
15TH. 

THERE IS A GREAT TEMPERATURE EXTREME DIFFERENCE FOR OCTOBER.  THE RECORD
HIGH OCTOBER TEMPERATURE IS 90 DEGREES SET OCTOBER 1ST 1892, WHILE THE
COLDEST OCTOBER TEMPERATURE IS 2 BELOW ZERO SET ON OCTOBER 29TH 1917.  ON
10/02/1969...THE DENVER TEMPERATURE WAS 85 DEGREES. ON OCTOBER 3RD AND
4TH...15 INCHES OF SNOW FELL ACROSS THE AREA.  IN 1991...A RECORD HIGH OF
89 DEGREES WAS SET ON THE 16TH FOLLOWED BY RECORD LOWS OF 7 DEGREES ON THE
30TH AND 10 DEGREES ON THE 31ST.  

ONE OF DENVER'S MOST FAMOUS SNOWSTORMS WAS THE "BRONCO BLIZZARD" WHICH
OCCURRED ON OCTOBER 15TH 1984.  THIS STORM WAS WITNESSED BY A NATIONWIDE
TELEVISION AUDIENCE ON MONDAY NIGHT FOOTBALL.  BY THE TIME THE GAME
ENDED...THE ENTIRE FIELD WAS COVERED BY 3 TO 4 INCHES OF SNOW.  BY THE TIME
THE STORM ENDED...OVER A FOOT OF SNOW HAD FALLEN OVER MOST OF THE METRO
AREA.  OCTOBER 1997 TURNED OUT TO BE A SNOW RECORD SETTER.  THE BLIZZARD OF
OCTOBER 24TH-25TH PRODUCED 19.1 INCHES OF SNOW IN A 24 HOUR PERIOD SETTING
A NEW OCTOBER RECORD.  BEFORE THE STORM ENDED...21.9 INCHES OF SNOW HAD
FALLEN ON THE OLD STAPLETON INTERNATIONAL AIRPORT DURING THE 2 DAY PERIOD.
THE MONTH FINISHED WITH 22.1 INCHES MAKING IT THE 3RD SNOWIEST OCTOBER IN
DENVER HISTORY.  

OCTOBER 2006 ENDED AN 11 MONTH BELOW NORMAL PRECIPITATION STREAK FOR
DENVER.  IT WAS BELOW NORMAL FROM NOVEMBER 2005 THROUGH SEPTEMBER 2006.
ALSO...OCTOBER 2006 HAD 4 SNOW EVENTS WITH MEASURABLE SNOWFALL WHICH IS
UNUSUAL.  THE MONTH FINISHED WITH 9.8 INCHES OF SNOWFALL WHICH WAS 5.7
INCHES ABOVE NORMAL.

              ...LOOKING BACK AT OCTOBER 2010...
 ...DENVER'S OCTOBER 2010 WAS WARMER AND DRIER THAN NORMAL...

OCTOBER 2010 WAS WARMER AND DRIER THAN NORMAL BUT NOT WARM OR DRY ENOUGH TO
GET INTO EITHER TOP 10 CATEGORY.  THE TEMPERATURES RANGED FROM A HIGH OF 85
DEGREES ON THE 3RD DOWN TO A LOW OF 20 DEGREES ON THE 28TH.  THE AVERAGE
TEMPERATURE WAS A WARM 55.3 DEGREES WHICH WAS 4.3 DEGREES ABOVE NORMAL.  NO
TEMPERATURE RECORDS WERE SET OR TIED DURING THE MONTH.  AMAZINGLY...THE
AVERAGE TEMPERATURE DURING OCTOBER 2009 WAS 42.9 DEGREES WHICH WAS 12.4
DEGREES COLDER THAN THIS YEAR'S AVERAGE.  THIS OCTOBER...THERE WERE ONLY 2
DAYS WHEN THE MINIMUM TEMPERATURE DROPPED TO 32 DEGREES OR BELOW.  THIS
COMPARES TO 17 DAYS WITH 32 DEGREES OR LOWER DURING OCTOBER 2009.  THE
NORMAL NUMBER OF DAYS WITH LOWS BELOW 32 DEGREES IS 9.  THERE WERE 300
HEATING DEGREE DAYS THIS YEAR COMPARED TO 676 LAST YEAR DURING OCTOBER. 
THIS OCTOBER...THERE WERE 8 COOLING DEGREE DAYS WHILE LAST YEAR THERE WERE
NONE. THE WARMEST OCTOBER WAS IN 1950 WITH AN INCREDIBLE 59.9 AVERAGE
MERCURY READING WHILE THE COLDEST WAS A CHILLY 39.0 RECORDED IN 1969. 
OCTOBER 2009 FINISHED AS THE SECOND COLDEST OCTOBER IN DENVER WEATHER
HISTORY SINCE 1872 WHILE OCTOBER 2010 APPEARED TO HAVE RANKED AS THE 11TH
WARMEST...0.1 DEGREE BELOW THE 10TH PLACE HOLDER.

PRECIPITATION DURING OCTOBER 2010 WAS ON THE DISMAL SIDE.  ONLY 0.54 INCH
FELL INTO THE RAIN BUCKET COMPARED TO THE OCTOBER NORMAL OF 0.99 INCH.
THERE WERE ONLY 4 DAYS WITH MEASURABLE MOISTURE.  A DECENT AMOUNT OF
RAINFALL WAS COLLECTED ON THE 12TH WHEN 0.34 INCH REGISTERED IN THE GAGE
WHICH WAS MORE THAN HALF OF THE MONTH'S TOTAL.  THE WETTEST OCTOBER WAS
4.17 INCHES IN 1969 WHILE THE DRIEST WAS ONLY A TRACE IN 1934.  SNOWFALL
WAS NON-EXISTENT DURING OCTOBER WHICH IS THE 15TH TIME SINCE 1882 THAT
THERE WAS NO SNOWFALL IN DENVER DURING OCTOBER.  THE LAST TIME WHEN OCTOBER
HAD ZERO SNOWFALL WAS IN 2003.  THERE WERE 14 TIMES SINCE 1882 WHEN OCTOBER
ONLY SQUEEZED OUT A TRACE OF SNOWFALL.  THE AVERAGE SNOWFALL FOR OCTOBER IS
4.1 INCHES.  SEASONAL SNOWFALL SO FAR...JULY THROUGH OCTOBER...REMAINS AT
ZERO.

THERE WERE 3 DAYS AT THE DENVER INTERNATIONAL AIRPORT WHEN THUNDERSTORMS
WERE OBSERVED.  TOTAL PRECIPITATION FROM THE 3 STORMS WAS A MERE 0.02
INCH.  THERE WERE 2 DAYS WITH FOG...WITH THE MORNING OF THE 23RD REPORTING
DENSE FOG (VISIBILITY 1/4 MILE OR LESS).  PEAK WIND FOR THE MONTH WAS 51
MPH FROM A NORTHERLY DIRECTON (350 DEGREES).

THE DENVER OUTLOOK FOR OCTOBER 2011:  THE NATIONAL WEATHER SERVICE 30-DAY
OUTLOOK MODELS SUGGEST ABOVE NORMAL TEMPERATURES AND NEAR NORMAL PRECIPITATION
FOR OCTOBER 2010.  

          DENVER NORMALS AND RECORDS ARE LISTED BELOW:
  ***********************************************************************
      ...DENVER'S AVERAGE AND RECORD OCTOBER STATISTICS...
                   (NORMALS PERIOD 1981-2010)
     
   ...TEMPERATURE...

AVERAGE HIGH......................... 65.3 
AVERAGE LOW.......................... 36.6 
MONTHLY MEAN......................... 50.9 
DAYS WITH HIGH 90 OR ABOVE...........  0 
DAYS WITH HIGH 32 OR BELOW...........  0* (* = LESS THAN 1) 
DAYS WITH LOW  32 OR BELOW...........  9
DAYS WITH LOWS ZERO OR BELOW.........  0

       ...PRECIPITATION...

MONTHLY MEAN......................... 0.97 INCH 
DAYS WITH MEASURABLE PRECIPITATION... 5 
AVERAGE SNOWFALL..................... M
DAYS WITH 1.0 INCH OR MORE SNOWFALL.. M 

*NOTE* AS OF THE 2007-2008 SNOWFALL SEASON...CONTRACT OBSERVERS BEGAN TAKING
SNOWFALL AND SNOW DEPTH OBSERVATIONS NEAR THE DENVER INTERNATIONAL AIRPORT.

   ...MISCELLANEOUS OCTOBER AVERAGES...

HEATING DEGREE DAYS.................. 440 
COOLING DEGREES DAYS.................   5
WIND SPEED (MPH).....................   7.8 
WIND DIRECTION.......................   SOUTH 
DAYS WITH THUNDERSTORMS..............   1
DAYS WITH DENSE FOG..................   1
PERCENT OF SUNSHINE POSSIBLE.........  72 

       ...OCTOBER EXTREMES...

RECORD HIGH................  90 DEGREES ON 10/01/1892
RECORD LOW.................  -2 DEGREES ON 10/29/1917
WARMEST....................  59.9 DEGREES IN 1950
COLDEST....................  39.0 DEGREES IN 1969
WETTEST....................   4.17 INCHES IN 1969
MAXIMUM 24 HOUR RAINFALL...   2.58 INCHES IN 1892 (12-13)
DRIEST.....................  TRACE IN 1934 
SNOWIEST...................  31.2 INCHES IN 1969 
MAXIMUM 24 HOUR SNOWFALL.... 19.1 INCHES IN 1997 (24-25)(BLIZZARD OF 1997)
LEAST SNOWIEST..............  0.0 (2010 AND 14 PREVIOUS YEARS)
                                REPORTED NO SNOW DURING OCTOBER)
MOST HEATING DEGREE DAYS.... 801 IN 1969 SINCE 1899
LEAST HEATING DEGREE DAYS... 159 IN 1950 SINCE 1899
MOST COOLING DEGREE DAYS....  14 IN 2006 AND 2005 (SINCE 1969)
LEAST COOLING DEGREE DAYS...   0 RECORDED IN 23 PREVIOUS YEARS LAST 2009 
                               (SINCE 1969) 
$$
BENTON

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