349  
CDUS41 KLWX 250527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT SUN JUL 25 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 24 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 87 3:10 PM 99 2010 88 -1 84  
MINIMUM 61 4:02 AM 48 1985 67 -6 73  
AVERAGE 74 77 -3 79  
 
PRECIPITATION (IN)  
YESTERDAY T 0.86 2020 0.14 -0.14 0.86  
MONTH TO DATE 2.40 3.27 -0.87 4.33  
SINCE JUN 1 6.05 7.57 -1.52 9.54  
SINCE JAN 1 19.63 24.81 -5.18 26.06  
 
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 14  
MONTH TO DATE 318 286 32 386  
SINCE JUN 1 612 524 88 659  
SINCE JAN 1 721 630 91 736    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION S (180)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 6.9  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 84 5:00 AM  
LOWEST 53 2:00 PM  
AVERAGE 69  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 100 2016  
MINIMUM TEMPERATURE (F) 67 55 1976  
 
SUNRISE AND SUNSET  
JULY 25 2021..........SUNRISE 6:05 AM EDT SUNSET 8:27 PM EDT  
JULY 26 2021..........SUNRISE 6:06 AM EDT SUNSET 8:26 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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