604  
CDUS41 KLWX 100532  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
132 AM EDT MON MAY 10 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 9 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 68 3:09 PM 91 1963 74 -6 50  
MINIMUM 40 1:32 AM 30 1976 51 -11 33  
AVERAGE 54 62 -8 42  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.93 1974 0.15 -0.15 0.00  
MONTH TO DATE 1.02 1.29 -0.27 1.55  
SINCE MAR 1 5.57 8.26 -2.69 9.10  
SINCE JAN 1 11.73 13.81 -2.08 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 11 5 6 23  
MONTH TO DATE 55 49 6 88  
SINCE MAR 1 870 1016 -146 918  
SINCE JUL 1 4063 4526 -463 4062  
 
COOLING  
YESTERDAY 0 2 -2 0  
MONTH TO DATE 17 14 3 4  
SINCE MAR 1 43 36 7 7  
SINCE JAN 1 43 36 7 7    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION S (180)  
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 7.1  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 89 1:00 AM  
LOWEST 39 2:00 PM  
AVERAGE 64  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 90 1963  
MINIMUM TEMPERATURE (F) 51 31 1966  
1983  
 
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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