537  
CDUS41 KLWX 120523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT WED MAY 12 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 11 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 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)  
YESTERDAY 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)  
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 T 4.0 -4.0 T  
SINCE JUL 1 12.0 21.0 -9.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 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  
YESTERDAY 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 6.9  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 76 5:00 AM  
LOWEST 34 11:00 PM  
AVERAGE 55  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 90 2018  
MINIMUM TEMPERATURE (F) 52 34 1969  
 
SUNRISE AND SUNSET  
MAY 12 2021...........SUNRISE 6:00 AM EDT SUNSET 8:13 PM EDT  
MAY 13 2021...........SUNRISE 5:59 AM EDT SUNSET 8:14 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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