265  
CDUS41 KLWX 020523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT SUN MAY 02 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 1 2021
 
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
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 5:23 PM 90 2010 71 -2 64  
MINIMUM 46 5:52 AM 33 1996 47 -1 50  
AVERAGE 58 59 -1 57  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.42 1981 0.13 -0.13 0.18  
MONTH TO DATE 0.00 0.13 -0.13 0.18  
SINCE MAR 1 4.55 6.98 -2.43 7.73  
SINCE JAN 1 10.71 12.40 -1.69 14.30  
 
SNOWFALL (IN)  
YESTERDAY 0.0 T 1963 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE MAR 1 T 3.1 -3.1 T  
SINCE JUL 1 12.0 22.0 -10.0 2.9  
SNOW DEPTH MM  
 
DEGREE DAYS  
HEATING  
YESTERDAY 7 7 0 8  
MONTH TO DATE 7 7 0 8  
SINCE MAR 1 822 989 -167 838  
SINCE JUL 1 4015 4579 -564 3982  
 
COOLING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 0 1 -1 0  
SINCE MAR 1 26 21 5 3  
SINCE JAN 1 26 21 5 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 31 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 43 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 12.4  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 47 10:00 PM  
LOWEST 20 4:00 PM  
AVERAGE 34  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 72 88 1992  
2010  
2018  
MINIMUM TEMPERATURE (F) 47 34 1960  
1979  
 
SUNRISE AND SUNSET  
MAY 2 2021...........SUNRISE 6:10 AM EDT SUNSET 8:04 PM EDT  
MAY 3 2021...........SUNRISE 6:09 AM EDT SUNSET 8:05 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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