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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 ................................................................. 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 |