069  
CDUS41 KLWX 012124  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
524 PM EDT SUN AUG 01 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 1 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 75 3:59 PM 100 1980 87 -12 86  
MINIMUM 69 4:31 AM 54 1997 67 2 70  
AVERAGE 72 77 -5 78  
 
PRECIPITATION (IN)  
TODAY 0.10 1.09 2018 0.12 -0.02 0.00  
MONTH TO DATE 0.10 0.12 -0.02 0.00  
SINCE JUN 1 6.18 8.57 -2.39 10.06  
SINCE JAN 1 19.76 25.81 -6.05 26.58  
 
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 7 12 -5 13  
MONTH TO DATE 7 12 -5 13  
SINCE JUN 1 721 628 93 787  
SINCE JAN 1 830 734 96 864    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION SE (150)  
AVERAGE WIND SPEED 3.7  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 3:00 PM  
LOWEST 71 12:00 AM  
AVERAGE 81  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 87 99 2002  
MINIMUM TEMPERATURE (F) 67 52 1998  
 
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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