174  
CDUS41 KLWX 180527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT TUE MAY 18 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 17 2021
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1960 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 75 4:15 PM 93 1960 75 0 67  
MINIMUM 45 5:39 AM 30 1984 53 -8 58  
AVERAGE 60 64 -4 63  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.22 1970 0.16 -0.16 T  
MONTH TO DATE 1.03 2.53 -1.50 1.62  
SINCE MAR 1 5.58 9.50 -3.92 9.17  
SINCE JAN 1 11.74 15.05 -3.31 15.74  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE MAR 1 T 4.0 -4.0 T  
SINCE JUL 1 12.0 21.0 -9.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 5 4 1 2  
MONTH TO DATE 115 81 34 156  
SINCE MAR 1 930 1048 -118 986  
SINCE JUL 1 4123 4558 -435 4130  
 
COOLING  
YESTERDAY 0 3 -3 0  
MONTH TO DATE 17 32 -15 19  
SINCE MAR 1 43 54 -11 22  
SINCE JAN 1 43 54 -11 22    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION S (160)  
AVERAGE WIND SPEED 2.3  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 6:00 AM  
LOWEST 38 3:00 PM  
AVERAGE 68  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 91 1987  
MINIMUM TEMPERATURE (F) 54 33 1973  
 
SUNRISE AND SUNSET  
MAY 18 2021...........SUNRISE 5:54 AM EDT SUNSET 8:19 PM EDT  
MAY 19 2021...........SUNRISE 5:54 AM EDT SUNSET 8:19 PM EDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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