448  
CDUS41 KLWX 230525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT MON AUG 23 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 22 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 86 12:59 PM 101 1983 86 0 84  
MINIMUM 70 2:42 AM 51 1969 65 5 72  
1976  
AVERAGE 78 75 3 78  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.94 2009 0.11 -0.11 0.29  
MONTH TO DATE 3.60 2.49 1.11 5.50  
SINCE JUN 1 9.68 10.94 -1.26 15.56  
SINCE JAN 1 23.26 28.18 -4.92 32.08  
 
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 13 10 3 13  
MONTH TO DATE 284 249 35 282  
SINCE JUN 1 998 865 133 1056  
SINCE JAN 1 1107 971 136 1133    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION N (10)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 4.2  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 3:00 AM  
LOWEST 61 10:00 AM  
AVERAGE 77  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 86 96 1998  
MINIMUM TEMPERATURE (F) 65 47 1981  
 
SUNRISE AND SUNSET  
AUGUST 23 2021........SUNRISE 6:31 AM EDT SUNSET 7:53 PM EDT  
AUGUST 24 2021........SUNRISE 6:32 AM EDT SUNSET 7:52 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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