840  
CDUS41 KLWX 010525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT SUN AUG 01 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 31 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 83 4:52 PM 98 1999 88 -5 79  
MINIMUM 64 1:15 AM 50 1997 67 -3 72  
AVERAGE 74 77 -3 76  
 
PRECIPITATION (IN)  
YESTERDAY T 1.87 1978 0.13 -0.13 0.32  
MONTH TO DATE 2.43 4.15 -1.72 4.85  
SINCE JUN 1 6.08 8.45 -2.37 10.06  
SINCE JAN 1 19.66 25.69 -6.03 26.58  
 
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 9 12 -3 11  
MONTH TO DATE 420 378 42 501  
SINCE JUN 1 714 616 98 774  
SINCE JAN 1 823 722 101 851    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION SW (220)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION SW (220)  
AVERAGE WIND SPEED 4.1  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 68 11:00 PM  
LOWEST 42 2:00 PM  
AVERAGE 55  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 87 100 1980  
MINIMUM TEMPERATURE (F) 67 54 1997  
 
SUNRISE AND SUNSET  
AUGUST 1 2021........SUNRISE 6:11 AM EDT SUNSET 8:21 PM EDT  
AUGUST 2 2021........SUNRISE 6:12 AM EDT SUNSET 8:20 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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