520  
CDUS41 KLWX 172129  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
529 PM EDT TUE AUG 17 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 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 86 3:28 PM 101 1988 87 -1 85  
MINIMUM 70 3:20 AM 44 1979 65 5 61  
AVERAGE 78 76 2 73  
 
PRECIPITATION (IN)  
TODAY 0.28 3.32 1997 0.11 0.17 T  
MONTH TO DATE 2.48 1.95 0.53 5.04  
SINCE JUN 1 8.56 10.40 -1.84 15.10  
SINCE JAN 1 22.14 27.64 -5.50 31.62  
 
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 JUN 1 0.0 0.0 0.0 0.0  
SINCE JUL 1 0.0 0.0 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 6 13 -7 5  
SINCE JUL 1 0 0 0 0  
 
COOLING  
TODAY 13 11 2 8  
MONTH TO DATE 211 197 14 232  
SINCE JUN 1 925 813 112 1006  
SINCE JAN 1 1034 919 115 1083    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 5.1  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
THUNDERSTORM  
HEAVY RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 6:00 AM  
LOWEST 63 3:00 PM  
AVERAGE 80  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 86 98 2009  
MINIMUM TEMPERATURE (F) 65 45 1981  
 
SUNRISE AND SUNSET  
AUGUST 17 2021........SUNRISE 6:25 AM EDT SUNSET 8:02 PM EDT  
AUGUST 18 2021........SUNRISE 6:26 AM EDT SUNSET 8:00 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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