305  
CDUS41 KLWX 102125  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
525 PM EDT MON MAY 10 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 10 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 69 1:10 AM 90 1963 74 -5 64  
MINIMUM 51 8:49 AM 31 1966 51 0 33  
1983  
AVERAGE 60 62 -2 49  
 
PRECIPITATION (IN)  
TODAY T 1.61 1990 0.15 -0.15 0.00  
MONTH TO DATE 1.02 1.44 -0.42 1.55  
SINCE MAR 1 5.57 8.41 -2.84 9.10  
SINCE JAN 1 11.73 13.96 -2.23 15.67  
 
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 MAR 1 T 4.0 -4.0 T  
SINCE JUL 1 12.0 21.0 -9.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 5 4 1 16  
MONTH TO DATE 60 53 7 104  
SINCE MAR 1 875 1020 -145 934  
SINCE JUL 1 4068 4530 -462 4078  
 
COOLING  
TODAY 0 2 -2 0  
MONTH TO DATE 17 16 1 4  
SINCE MAR 1 43 38 5 7  
SINCE JAN 1 43 38 5 7    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 22 HIGHEST WIND DIRECTION N (340)  
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 13.4  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 75 2:00 AM  
LOWEST 38 4:00 PM  
AVERAGE 57  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 90 1993  
MINIMUM TEMPERATURE (F) 52 29 1966  
 
SUNRISE AND SUNSET  
MAY 10 2021...........SUNRISE 6:02 AM EDT SUNSET 8:11 PM EDT  
MAY 11 2021...........SUNRISE 6:01 AM EDT SUNSET 8:12 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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