CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
612 PM MDT FRI MAY 1 2009
...................................
...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF APRIL 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 04/30/1992
LOW -2 04/02/1975
HIGHEST 79 04/23 82 04/15/30
LOWEST 16 04/06 13 04/01
AVG. MAXIMUM 58.9 60.9 -2.0 61.6
AVG. MINIMUM 32.9 34.2 -1.3 30.6
MEAN 45.9 47.6 -1.7 46.1
DAYS MAX >= 90 0 0.2 -0.2 0
DAYS MAX <= 32 1 0.2 0.8 0
DAYS MIN <= 32 14 11.4 2.6 21
DAYS MIN <= 0 0 0.1 -0.1 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 8.24 1900
MINIMUM 0.03 1963
TOTALS 3.22 1.93 1.29 0.32
DAILY AVG. 0.11 0.06 0.05 0.01
DAYS >= .01 10 8.5 1.5 4
DAYS >= .10 5 MM MM 1
DAYS >= .50 3 MM MM 0
DAYS >= 1.00 1 MM MM 0
GREATEST
24 HR. TOTAL 1.42 04/16 TO 04/17 0.18 04/09
SNOWFALL (INCHES)
RECORDS
TOTAL 33.8 1933
TOTALS 7.4 9.1
DEGREE_DAYS
HEATING TOTAL 566 524 42 558
SINCE 7/1 5334 5801 -467 5689
COOLING TOTAL 0 2 -2 0
SINCE 1/1 0 2 -2 0
FREEZE DATES
RECORD
EARLIEST 09/08/1962
LATEST 06/08/2007
EARLIEST 10/07
LATEST 05/05
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WIND (MPH)
AVERAGE WIND SPEED 12.3
RESULTANT WIND SPEED/DIRECTION 1/187
HIGHEST WIND SPEED/DIRECTION 52/360 DATE 04/04
HIGHEST GUST SPEED/DIRECTION 63/360 DATE 04/04
SKY COVER
POSSIBLE SUNSHINE (PERCENT) 62
NUMBER OF DAYS FAIR 4
NUMBER OF DAYS PC 18
NUMBER OF DAYS CLOUDY 8
AVERAGE RH (PERCENT) 60
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 2 MIXED PRECIP 0
HEAVY RAIN 2 RAIN 3
LIGHT RAIN 6 FREEZING RAIN 0
LT FREEZING RAIN 1 HAIL 0
HEAVY SNOW 1 SNOW 5
LIGHT SNOW 9 SLEET 0
FOG 13 FOG W/VIS <= 1/4 MILE 3
HAZE 4
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$
...DENVER'S APRIL 2009 GETS A SOAKING...
A 24 HOUR CALENDAR DAY PRECIPITATION RECORD WAS ESTABLISHED ON APRIL
17TH WHEN 1.16 INCHES OF LIQUID WAS COLLECTED IN THE RAIN BUCKET. THE
OLD RECORD WAS 1.00 INCH RECORDED IN 1920. THE SPRING STORM ACTUALLY
COVERED A 3 DAY PERIOD FROM APRIL 16TH THROUGH THE 18TH. THE TOTAL FOR
THE 3 DAY OCCURRENCE WAS A WHOPPING 2.45 INCHES. THAT IS 2.5 TIMES MORE
THAN THE FIRST 3 MONTHS OF 2009. FOR THE MONTH...3.22 INCHES WAS THE
TOTAL WHICH WAS 1.29 INCHES ABOVE...YES ABOVE...THE NORMAL. AN
INTERESTING TIDBIT IS THAT THE ANNUAL PRECIPITATION AS OF APRIL 30TH
WAS 4.22 INCHES WHICH AMAZINGLY WAS 0.01 INCH "ABOVE" NORMAL. THE 3.22
INCHES WAS NOT EVEN CLOSE TO GETTING INTO THE TOP 10 WETTEST APRILS.
IN TENTH PLACE WAS 3.75 INCHES IN 1914 AND THE TOP PLACE HOLDER WAS IN
1900 WHEN 8.24 INCHES OF LIQUID WAS COLLECTED...THE SECOND WETTEST MONTH
IN DENVER WEATHER HISTORY. ONLY MAY 1876 HAD MORE WITH A TOTAL OF 8.57
INCHES. SNOWFALL WAS NOT AS SIGNIFICANT AS ONLY 7.4 INCHES FELL ON THE
DENVER INTERNATIONAL AIRPORT (DIA). THAT TOTAL WAS 1.7 INCHES BELOW THE
NORMAL OF 9.1 INCHES. 4.5 INCHES OF SNOWFALL FELL ON THE 27TH MAINTAINING
4 INCHES OF SNOW DEPTH BUT BECAUSE OF THE 70 DEGREE TEMPERATURE ON THE
28TH...THE SNOW DEPTH COMPLETELY DISAPPEARED ON THE 28TH. THIS IS WHAT
IS KNOWN AS "SPRINGTIME IN THE ROCKIES". FOR THE SEASON...THE TOTAL
SNOWFALL HAS MOVED UP TO 38.1 INCHES WHICH IS STILL 22.3 INCHES BELOW
THE JULY THROUGH APRIL NORMAL OF 60.4 INCHES.
THERE WERE 2 THUNDERSTORMS OBSERVED AT DIA BOTH OCCURRING DURING THE
INTENSE PRECIPITATION PERIOD OF APRIL 16TH AND 17TH. TEN DAYS HAD
MEASURABLE LIQUID...5 HAD 0.1 INCH OR MORE...3 HAD A HALF AN INCH OR
MORE AND FINALLY ONE DAY...THE 17TH HAD MORE THAN 1 INCH. THERE WERE
13 DAYS WITH LIGHT FOG AND 3 DAYS WITH DENSE FOG WHICH IS VISIBILITY
OF 1/4 MILE OR LESS. THE PEAK WIND GUST DURING THE MONTH WAS 63 MPH
FROM A NORTHERLY DIRECTION (360 DEGREES). THIS 63 MPH WIND GUST
ESTABLISHED A NEW WIND GUST RECORD FOR APRIL BREAKING THE OLD RECORD
OF 62 MPH ESTABLISHED IN 1986.
BENTON/IMU
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