444  
CDUS41 KLWX 310523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT TUE AUG 31 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 30 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 91 12:57 PM 99 1991 85 6 83  
MINIMUM 72 10:46 PM 41 1986 63 9 60  
AVERAGE 82 74 8 72  
 
PRECIPITATION (IN)  
YESTERDAY 0.01 1.21 1978 0.11 -0.10 0.00  
MONTH TO DATE 4.91 3.42 1.49 7.09  
SINCE JUN 1 10.99 11.87 -0.88 17.15  
SINCE JAN 1 24.57 29.11 -4.54 33.67  
 
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 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  
YESTERDAY 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  
YESTERDAY 17 9 8 7  
MONTH TO DATE 417 326 91 396  
SINCE JUN 1 1131 942 189 1170  
SINCE JAN 1 1240 1048 192 1247    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION W (260)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION W (260)  
AVERAGE WIND SPEED 3.9  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
LIGHT RAIN  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 3:00 AM  
LOWEST 52 1:00 PM  
AVERAGE 75  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 84 98 1991  
MINIMUM TEMPERATURE (F) 63 43 1976  
 
SUNRISE AND SUNSET  
AUGUST 31 2021........SUNRISE 6:38 AM EDT SUNSET 7:41 PM EDT  
SEPTEMBER 1 2021.....SUNRISE 6:39 AM EDT SUNSET 7:40 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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