599  
CDUS41 KLWX 010526  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
126 AM EDT SAT MAY 01 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 30 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 72 3:16 PM 86 1974 71 1 67  
2007  
2017  
MINIMUM 50 11:59 PM 29 1977 46 4 54  
AVERAGE 61 59 2 61  
 
PRECIPITATION (IN)  
YESTERDAY 0.01 3.99 2014 0.11 -0.10 1.38  
MONTH TO DATE 2.28 3.47 -1.19 5.56  
SINCE MAR 1 4.55 6.85 -2.30 7.55  
SINCE JAN 1 10.71 12.27 -1.56 14.12  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.0 2001 0.0 0.0 0.0  
2002  
MONTH TO DATE T 0.3 -0.3 T  
SINCE MAR 1 T 3.1 -3.1 T  
SINCE JUL 1 12.0 22.0 -10.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 4 7 -3 4  
MONTH TO DATE 300 337 -37 382  
SINCE MAR 1 815 984 -169 830  
SINCE JUL 1 4008 4574 -566 3974  
 
COOLING  
YESTERDAY 0 1 -1 0  
MONTH TO DATE 22 17 5 0  
SINCE MAR 1 26 20 6 3  
SINCE JAN 1 26 20 6 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 43 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 59 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 22.9  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 76 12:00 AM  
LOWEST 25 3:00 PM  
AVERAGE 51  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 71 90 2010  
MINIMUM TEMPERATURE (F) 47 33 1996  
 
SUNRISE AND SUNSET  
MAY 1 2021...........SUNRISE 6:12 AM EDT SUNSET 8:03 PM EDT  
MAY 2 2021...........SUNRISE 6:10 AM EDT SUNSET 8:04 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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