006 CXUS51 KLWX 051958 CLMIAD CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 358 PM EDT WED JUN 5 2013 ................................... ...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF MAY 2013... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1962 TO 2013 WEATHER OBSERVED NORMAL DEPART LAST YEAR'S VALUE DATE(S) VALUE FROM VALUE NORMAL ............................................................. TEMPERATURE (F) RECORD HIGH 97 05/29/1969 LOW 27 05/19/2010 HIGHEST 90 05/30 89 1 LOWEST 32 05/14 35 -3 AVG. MAXIMUM 74.4 75.1 -0.7 78.8 AVG. MINIMUM 52.5 51.2 1.3 58.1 MEAN 63.5 63.2 0.3 DAYS MAX >= 90 1 1.1 -0.1 DAYS MAX <= 32 0 0.0 0.0 DAYS MIN <= 32 1 0.2 0.8 DAYS MIN <= 0 0 0.0 0.0 PRECIPITATION (INCHES) RECORD MAXIMUM 10.26 2009 1988 MINIMUM 0.34 2007 TOTALS 3.20 4.55 -1.35 5.38 DAILY AVG. 0.10 0.15 -0.05 DAYS >= .01 10 12.2 -2.2 DAYS >= .10 7 7.5 -0.5 DAYS >= .50 1 3.2 -2.2 DAYS >= 1.00 1 1.0 0.0 GREATEST 24 HR. TOTAL 1.02 05/07 DEGREE_DAYS HEATING TOTAL 146 130 16 32 SINCE 7/1 4560 4702 -142 3761 COOLING TOTAL 109 72 37 146 SINCE 1/1 139 92 47 174 .............................................................. WIND (MPH) AVERAGE WIND SPEED 6.9 HIGHEST WIND SPEED/DIRECTION 29/320 DATE 05/24 HIGHEST GUST SPEED/DIRECTION 39/330 DATE 05/24 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.60 NUMBER OF DAYS FAIR 6 NUMBER OF DAYS PC 13 NUMBER OF DAYS CLOUDY 12 AVERAGE RH (PERCENT) 67 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 6 MIXED PRECIP 0 HEAVY RAIN 6 RAIN 3 LIGHT RAIN 15 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 13 FOG W/VIS <= 1/4 MILE 2 HAZE 6 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && THE MONTHLY AVERAGE TEMPERATURE FOR MAY WAS NEAR NORMAL. IT WAS THE FIRST TIME SINCE 2008 THAT THE MAY AVERAGE TEMPERATURE FOR DULLES WAS NOT WELL ABOVE NORMAL. THE MINIMUM TEMPERATURE OF 32F DEGREES ON THE 14TH TIED A DAILY RECORD LOW THAT WAS SET IN 1996. IT WAS ONLY THE 4TH TIME DULLES RECORDED A MINIMUM TEMPERATURE OF 32F DEGREES OR COLDER THIS LATE IN THE SPRING. THE OTHER OCCURRENCES WERE 17 MAY 1984 (30F)...22 MAY 2002 (31F) AND 14 MAY 1996 (32F). RAINFALL THIS MONTH WAS BELOW NORMAL. $$ JRK