662  
CDUS41 KLWX 172145  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
545 PM EDT MON MAY 17 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 17 2021
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 75 2:41 PM 93 1960 75 0 67  
MINIMUM 45 5:39 AM 30 1984 53 -8 58  
AVERAGE 60 64 -4 63  
 
PRECIPITATION (IN)  
TODAY 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)  
TODAY 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  
TODAY 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  
TODAY 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 2.5  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 6:00 AM  
LOWEST 38 3:00 PM  
AVERAGE 68  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 91 1987  
MINIMUM TEMPERATURE (F) 54 33 1973  
 
SUNRISE AND SUNSET  
MAY 17 2021...........SUNRISE 5:55 AM EDT SUNSET 8:18 PM EDT  
MAY 18 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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