743  
CDUS41 KLWX 110630  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
230 AM EDT SUN MAY 11 2025  
   
...............................  
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 10 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 74 4:47 PM 90 1963 74 0 64  
MINIMUM 40 5:32 AM 31 1966 51 -11 50  
1983  
AVERAGE 57 62 -5 57  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.61 1990 0.15 -0.15 0.08  
MONTH TO DATE 1.43 1.44 -0.01 1.60  
SINCE MAR 1 4.86 8.41 -3.55 7.23  
SINCE JAN 1 9.28 13.96 -4.68 14.68  
 
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 MAR 1 0.0 4.0 -4.0 T  
SINCE JUL 1 15.5 21.0 -5.5 11.7  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 8 4 4 8  
MONTH TO DATE 17 53 -36 23  
SINCE MAR 1 708 1020 -312 702  
SINCE JUL 1 4030 4530 -500 3666  
 
COOLING  
YESTERDAY 0 2 -2 0  
MONTH TO DATE 29 16 13 42  
SINCE MAR 1 76 38 38 86  
SINCE JAN 1 76 38 38 89    
...............................................................  
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 7.6  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 63 5:00 AM  
LOWEST 26 5:00 PM  
AVERAGE 45  
   
......................................................  
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 90 1993  
MINIMUM TEMPERATURE (F) 52 29 1966  
 
SUNRISE AND SUNSET  
MAY 11 2025...........SUNRISE 6:01 AM EDT SUNSET 8:12 PM EDT  
MAY 12 2025...........SUNRISE 6:00 AM EDT SUNSET 8:13 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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