909  
CDUS41 KLWX 172123  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
523 PM EDT SAT APR 17 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 17 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 60 3:30 PM 93 2002 67 -7 59  
MINIMUM 38 4:23 AM 27 1983 43 -5 29  
AVERAGE 49 55 -6 44  
 
PRECIPITATION (IN)  
TODAY 0.00 1.44 2000 0.11 -0.11 T  
MONTH TO DATE 1.51 1.99 -0.48 2.79  
SINCE MAR 1 3.78 5.37 -1.59 4.78  
SINCE JAN 1 9.94 10.79 -0.85 11.35  
 
SNOWFALL (IN)  
TODAY 0.0 T 1983 0.0 0.0 0.0  
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  
TODAY 16 11 5 21  
MONTH TO DATE 183 223 -40 211  
SINCE MAR 1 698 870 -172 659  
SINCE JUL 1 3891 4460 -569 3803  
 
COOLING  
TODAY 0 1 -1 0  
MONTH TO DATE 5 5 0 0  
SINCE MAR 1 9 8 1 3  
SINCE JAN 1 9 8 1 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 7.3  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 86 4:00 AM  
LOWEST 44 3:00 PM  
AVERAGE 65  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 68 90 1976  
MINIMUM TEMPERATURE (F) 43 29 2018  
 
SUNRISE AND SUNSET  
APRIL 17 2021.........SUNRISE 6:30 AM EDT SUNSET 7:49 PM EDT  
APRIL 18 2021.........SUNRISE 6:29 AM EDT SUNSET 7:50 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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