603  
CDUS41 KLWX 172128  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
428 PM EST THU DEC 17 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 17 2020
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
CLIMATE RECORD PERIOD: 1960 TO 2020  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
TODAY  
MAXIMUM 36 3:47 PM 70 1984 45 -9 40  
MINIMUM 28 7:29 AM 3 1989 27 1 34  
AVERAGE 32 36 -4 37  
 
PRECIPITATION (IN)  
TODAY 0.01 0.75 2000 0.09 -0.08 0.07  
MONTH TO DATE 3.54 1.77 1.77 2.34  
SINCE DEC 1 3.54 1.77 1.77 2.34  
SINCE JAN 1 47.19 40.35 6.84 40.18  
 
SNOWFALL (IN)  
TODAY 0.0 4.3 1973 0.1 -0.1 0.0  
MONTH TO DATE 2.3 1.7 0.6 0.6  
SINCE DEC 1 2.3 1.7 0.6 0.6  
SINCE JUL 1 2.3 2.2 0.1 0.6  
SNOW DEPTH 1  
 
DEGREE DAYS  
HEATING  
TODAY 33 29 4 28  
MONTH TO DATE 420 455 -35 443  
SINCE DEC 1 420 455 -35 443  
SINCE JUL 1 1087 1371 -284 1306  
 
COOLING  
TODAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1406 1178 228 1524    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION N (350)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 9.0  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT SNOW  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 12:00 AM  
LOWEST 72 1:00 PM  
AVERAGE 82  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 76 2006  
MINIMUM TEMPERATURE (F) 26 3 1989  
 
SUNRISE AND SUNSET  
DECEMBER 17 2020......SUNRISE 7:23 AM EST SUNSET 4:49 PM EST  
DECEMBER 18 2020......SUNRISE 7:24 AM EST SUNSET 4:50 PM EST  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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