350  
CDUS41 KLWX 110529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
129 AM EDT TUE MAY 11 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 10 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 1:10 AM 90 1963 74 -5 64  
MINIMUM 45 11:27 PM 31 1966 51 -6 33  
1983  
AVERAGE 57 62 -5 49  
 
PRECIPITATION (IN)  
YESTERDAY 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)  
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 16  
MONTH TO DATE 63 53 10 104  
SINCE MAR 1 878 1020 -142 934  
SINCE JUL 1 4071 4530 -459 4078  
 
COOLING  
YESTERDAY 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 11.7  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 75 2:00 AM  
LOWEST 37 6:00 PM  
AVERAGE 56  
   
......................................................
 
 
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 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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