589  
CXUS51 KLWX 011318  
CLMIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
918 AM EDT SAT JUN 01 2024  
   
...............................  
 
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF MAY 2024...  
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1960 TO 2024  
 
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S  
VALUE DATE(S) VALUE FROM VALUE  
NORMAL    
..........................................................  
 
TEMPERATURE (F)  
RECORD  
HIGH 97 05/29/1969  
LOW 28 05/07/1970  
HIGHEST 91 05/02 89 2 87  
05/22  
LOWEST 44 05/13 35 9 39  
AVG. MAXIMUM 77.7 75.0 2.7 74.6  
AVG. MINIMUM 57.5 53.0 4.5 49.6  
MEAN 67.6 64.0 3.6 62.1  
DAYS MAX >= 90 2 1.4 0.6 0  
DAYS MAX <= 32 0 0.0 0.0 0  
DAYS MIN <= 32 0 0.2 -0.2 0  
DAYS MIN <= 0 0 0.0 0.0 0  
 
PRECIPITATION (INCHES)  
RECORD  
MAXIMUM 10.26 2009  
MINIMUM 0.34 2007  
TOTALS 4.22 4.72 -0.50 1.48  
DAILY AVG. 0.14 0.15 -0.01 0.05  
DAYS >= .01 16 12.7 3.3 8  
DAYS >= .10 10 8.0 2.0 4  
DAYS >= .50 3 3.6 -0.6 0  
DAYS >= 1.00 0 0.9 -0.9 0  
GREATEST  
24 HR. TOTAL 1.21 05/03 TO 05/04 1.03  
STORM TOTAL 0.84 0.43  
(MM/DD(HH))  
 
SNOWFALL (INCHES)  
RECORDS  
TOTAL T 1963  
TOTALS 0.0 0.0 0.0 0.0  
SINCE 7/1 11.7 21.0 -9.3 MM  
DAYS >= TRACE 0 0.0 0.0 0  
DAYS >= 1.0 0 0.0 0.0 0  
GREATEST  
SNOW DEPTH 0 0  
 
DEGREE DAYS  
HEATING TOTAL 48 115 -67 110  
SINCE 7/1 3691 4593 -902 MM  
COOLING TOTAL 136 84 52 29  
SINCE 1/1 183 106 77 MM    
..........................................................  
 
WIND (MPH)  
AVERAGE WIND SPEED 5.3  
HIGHEST WIND SPEED/DIRECTION 33/300  
33/300  
HIGHEST GUST SPEED/DIRECTION 45/290  
 
SKY COVER  
AVERAGE SKY COVER 0.65  
 
AVERAGE RH (PERCENT) 71  
 
WEATHER CONDITIONS. NUMBER OF DAYS WITH  
THUNDERSTORM 7 MIXED PRECIP 0  
HEAVY RAIN 4 RAIN 8  
LIGHT RAIN 19 FREEZING RAIN 0  
LT FREEZING RAIN 0 HAIL 0  
HEAVY SNOW 0 SNOW 0  
LIGHT SNOW 0 SLEET 0  
FOG 20 FOG W/VIS <= 1/4 MILE 1  
HAZE 5  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 
 
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