CLIMATE REPORT...UPDATED
NATIONAL WEATHER SERVICE BOULDER, CO
1224 PM MST TUE NOV 3 2009
...................................
...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2009...
CLIMATE NORMAL PERIOD 1971 TO 2000
CLIMATE RECORD PERIOD 1872 TO 2009
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 84 10/18 90 -6 81 10/02
10/01
LOWEST 17 10/10 -2 19 23 10/27
AVG. MAXIMUM 54.7 66.0 -11.3 66.2
AVG. MINIMUM 31.1 35.9 -4.8 37.9
MEAN 42.9 51.0 -8.1 52.1
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 3 0.3 2.7 0
DAYS MIN <= 32 17 8.6 8.4 6
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 4.17 1969
MINIMUM T 1934
TOTALS 1.36 0.99 0.37 1.44
DAILY AVG. 0.04 0.03 0.01 0.05
DAYS >= .01 8 5.3 2.7 5
DAYS >= .10 5 MM MM 3
DAYS >= .50 0 MM MM 1
DAYS >= 1.00 0 MM MM 1
GREATEST
24 HR. TOTAL 0.39 10/20 TO 10/21 1.06 10/05/08
SNOWFALL (INCHES)
RECORDS
TOTAL 31.2 1969
TOTALS 17.2 4.1
DEGREE_DAYS
HEATING TOTAL 676 436 240 393
SINCE 7/1 815 582 233 537
COOLING TOTAL 0 0 0 0
SINCE 1/1 533 696 -163 825
FREEZE DATES
RECORD
EARLIEST 09/08/1962
LATEST 06/08/2007
EARLIEST 10/02 10/07
LATEST 05/05
.................................................................
WIND (MPH)
AVERAGE WIND SPEED 9.6
RESULTANT WIND SPEED/DIRECTION 1/293
HIGHEST WIND SPEED/DIRECTION 37/350 DATE 10/29
HIGHEST GUST SPEED/DIRECTION 54/200 DATE 10/05
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
NUMBER OF DAYS FAIR 4
NUMBER OF DAYS PC 14
NUMBER OF DAYS CLOUDY 13
AVERAGE RH (PERCENT) 63
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 1
LIGHT RAIN 7 FREEZING RAIN 0
LT FREEZING RAIN 3 HAIL 0
HEAVY SNOW 2 SNOW 4
LIGHT SNOW 9 SLEET 0
FOG 15 FOG W/VIS <= 1/4 MILE 9
HAZE 6
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$
...OCTOBER 2009 BECOMES DENVER'S SECOND COLDEST MONTH...
...OCTOBER 2009 HAS MOVED INTO 5TH SNOWIEST OCTOBER...
...NEW RECORD HIGH WIND GUST OF 54 MPH ON THE 5TH...
IT WAS AN EVENTFUL OCTOBER AS COLD TEMPERATURES PREVAILED AND A STRONG LATE
OCTOBER WINTER SNOW STORM THAT MOVED ACROSS DENVER.
THERE WERE 5 LOW TEMPERATURE RECORDS EITHER TIED OR BROKEN AND 1 HIGH
TEMPERATURE TIED. RECORD LOWS WERE ESTABLISHED ON OCTOBER 2ND...9TH AND 10TH.
A TIED RECORD LOW WAS ESTABLISHED ON THE 3RD. A NEW RECORD LOW MAXIMUM WAS SET
ON THE 26TH. ONLY ONE RECORD THAT DEALT WITH WARM TEMPERATURES WAS A TIED
RECORD HIGH ON THE THE 18TH. THE MONTH'S TEMPERATURES RANGED FROM A
THE TIED RECORD HIGH OF 84 DEGREES ON THE 18TH DOWN TO A LOW TEMPERATURE OF 17
DEGREES...ALSO A RECORD ON THE 10TH. THE AVERAGE TEMPERATURE FOR THE 10TH WAS
A VERY CHILLY 22 DEGREES. THE MONTH'S AVERAGE TEMPERATURE WAS ONLY 42.9
DEGREES WHICH MOVED OCTOBER 2009 INTO THE 2ND COLDEST OCTOBER IN DENVER
WEATHER HISTORY. THE COLDEST OCTOBER WAS A VERY FRIGID 39.0 DEGREES WHICH
WAS RECORDED IN 1969. THERE WERE 17 DAYS WHEN THE LOW TEMPERATURES WERE 32
DEGREES OR LOWER WHEREAS THE NORMAL AMOUNT IS ONLY 9. THREE HIGH TEMPERATURES
DID NOT MAKE IT TO THE FREEZING MARK WHICH IS 3 ABOVE NORMAL.
A STRONG WINTER STORM MOVED ACROSS THE DENVER METRO AREA WHICH INVOLVED
3 DAYS...27TH THROUGH THE 29TH. 15.3 INCHES OF SNOW WAS OFFICIALLY MEASURED
AT THE DENVER INTERNATIONAL AIRPORT (DIA). THIS STORM HELPED TO MOVE THE MONTH
INTO 5TH SNOWIEST OCTOBER WITH A TOTAL OF 17.2 INCHES. THERE WERE NUMEROUS
PLACES AROUND THE METRO AREA THAT MEASURED SNOW ABOVE 20 INCHES. IT HAS BEEN
A LONG TIME SINCE DENVER HAS BEEN ABOVE NORMAL FOR SNOWFALL IN OCTOBER. THE
17.2 INCHES WAS 11.0 INCHES ABOVE THE NORMAL OF 6.2 INCHES. THIS WINTER STORM
ACCOUNTED FOR 0.69 INCH OF THE OCTOBER TOTAL MOISTURE WHICH WAS A RESPECTABLE
1.39 INCHES. THIS WAS 0.37 INCH ABOVE THE NORMAL OF 0.99 INCH. IT WAS NOT
ENOUGH LIQUID TO GET INTO THE TOP 10 WETTEST. EIGHT DAYS HAD MEASURABLE
MOISTURE WITH 5 MEASURING 0.10 INCH OR MORE. NO RECORDS FOR PRECIPITATION WERE
SET OR TIED DURING OCTOBER 2009.
THERE WERE NO THUNDERSTORMS RECORDED AT DIA. EIGHT DAYS HAD DENSE FOG
OBSERVED WHICH IS VISIBILITY OF 1/4 MILE OR LESS. THE NORMAL AMOUNT OF DENSE
FOG AT DIA IS 1. THE PEAK WIND WAS 54 MPH FROM A SOUTHWEST DIRECTION ON THE
5TH. THIS ESTABLISHED A NEW HIGH WIND GUST SURPASSING THE OLD RECORD OF 48
MPH SET IN 1990.
BENTON/JK
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