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
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