338  
CDUS41 KLWX 112123  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
523 PM EDT TUE MAY 11 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 11 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 12:32 PM 90 1993 74 -5 60  
MINIMUM 44 12:05 AM 29 1966 52 -8 44  
AVERAGE 57 63 -6 52  
 
PRECIPITATION (IN)  
TODAY 0.00 3.73 2008 0.15 -0.15 T  
MONTH TO DATE 1.02 1.59 -0.57 1.55  
SINCE MAR 1 5.57 8.56 -2.99 9.10  
SINCE JAN 1 11.73 14.11 -2.38 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 8 4 4 13  
MONTH TO DATE 71 57 14 117  
SINCE MAR 1 886 1024 -138 947  
SINCE JUL 1 4079 4534 -455 4091  
 
COOLING  
TODAY 0 2 -2 0  
MONTH TO DATE 17 18 -1 4  
SINCE MAR 1 43 40 3 7  
SINCE JAN 1 43 40 3 7    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION W (250)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION W (270)  
AVERAGE WIND SPEED 4.7  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 76 5:00 AM  
LOWEST 37 12:00 PM  
AVERAGE 57  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 90 2018  
MINIMUM TEMPERATURE (F) 52 34 1969  
 
SUNRISE AND SUNSET  
MAY 11 2021...........SUNRISE 6:01 AM EDT SUNSET 8:12 PM EDT  
MAY 12 2021...........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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