810  
CDUS41 KLWX 302125  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
525 PM EDT FRI APR 30 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 30 2021
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 72 3:16 PM 86 1974 71 1 67  
2007  
2017  
MINIMUM 59 6:04 AM 29 1977 46 13 54  
AVERAGE 66 59 7 61  
 
PRECIPITATION (IN)  
TODAY T 3.99 2014 0.11 -0.11 1.38  
MONTH TO DATE 2.27 3.47 -1.20 5.56  
SINCE MAR 1 4.54 6.85 -2.31 7.55  
SINCE JAN 1 10.70 12.27 -1.57 14.12  
 
SNOWFALL (IN)  
TODAY MM 0.0 2001 0.0 MM 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 MM  
 
DEGREE DAYS  
HEATING  
TODAY 0 7 -7 4  
MONTH TO DATE 296 337 -41 382  
SINCE MAR 1 811 984 -173 830  
SINCE JUL 1 4004 4574 -570 3974  
 
COOLING  
TODAY 1 1 0 0  
MONTH TO DATE 23 17 6 0  
SINCE MAR 1 27 20 7 3  
SINCE JAN 1 27 20 7 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 43 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 59 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 22.7  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 76 12:00 AM  
LOWEST 25 3:00 PM  
AVERAGE 51  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 71 90 2010  
MINIMUM TEMPERATURE (F) 47 33 1996  
 
SUNRISE AND SUNSET  
APRIL 30 2021.........SUNRISE 6:13 AM EDT SUNSET 8:02 PM EDT  
MAY 1 2021...........SUNRISE 6:12 AM EDT SUNSET 8:03 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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