554  
CDUS41 KLWX 230623  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
223 AM EDT SAT AUG 23 2025  
   
...............................  
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 22 2025  
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1960 TO 2025  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................  
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 84 2:32 PM 101 1983 86 -2 78  
MINIMUM 64 11:59 PM 49 2024 65 -1 49  
AVERAGE 74 75 -1 64  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.94 2009 0.11 -0.11 0.00  
MONTH TO DATE 0.85 2.49 -1.64 3.05  
SINCE JUN 1 10.72 10.94 -0.22 6.40  
SINCE JAN 1 24.64 28.18 -3.54 23.70  
 
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 1  
MONTH TO DATE 0 0 0 2  
SINCE JUN 1 15 13 2 2  
SINCE JUL 1 0 0 0 2  
 
COOLING  
YESTERDAY 9 10 -1 0  
MONTH TO DATE 201 249 -48 273  
SINCE JUN 1 999 865 134 1126  
SINCE JAN 1 1117 971 146 1309    
...............................................................  
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION E (80)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION E (70)  
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 1:00 AM  
LOWEST 40 3:00 PM  
AVERAGE 67  
   
......................................................  
 
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 2025........SUNRISE 6:31 AM EDT SUNSET 7:53 PM EDT  
AUGUST 24 2025........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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