316  
CDUS41 KLWX 300525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT MON AUG 30 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 29 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 82 2:39 PM 98 1991 85 -3 86  
MINIMUM 72 6:28 AM 38 1982 63 9 72  
AVERAGE 77 74 3 79  
 
PRECIPITATION (IN)  
YESTERDAY 0.01 1.17 1963 0.11 -0.10 0.20  
MONTH TO DATE 4.90 3.31 1.59 7.09  
SINCE JUN 1 10.98 11.76 -0.78 17.15  
SINCE JAN 1 24.56 29.00 -4.44 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 12 9 3 14  
MONTH TO DATE 400 317 83 389  
SINCE JUN 1 1114 933 181 1163  
SINCE JAN 1 1223 1039 184 1240    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION E (70)  
HIGHEST GUST SPEED 12 HIGHEST GUST DIRECTION E (70)  
AVERAGE WIND SPEED 3.7  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 91 11:00 PM  
LOWEST 69 1:00 PM  
AVERAGE 80  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 85 99 1991  
MINIMUM TEMPERATURE (F) 63 41 1986  
 
SUNRISE AND SUNSET  
AUGUST 30 2021........SUNRISE 6:37 AM EDT SUNSET 7:43 PM EDT  
AUGUST 31 2021........SUNRISE 6:38 AM EDT SUNSET 7:41 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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