092  
CDUS41 KLWX 180529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1229 AM EST FRI DEC 18 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 17 2020
 
 
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)  
YESTERDAY  
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)  
YESTERDAY 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)  
YESTERDAY T 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  
YESTERDAY 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  
YESTERDAY 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 6.5  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
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 TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 76 2006  
MINIMUM TEMPERATURE (F) 26 3 1989  
 
SUNRISE AND SUNSET  
DECEMBER 18 2020......SUNRISE 7:24 AM EST SUNSET 4:50 PM EST  
DECEMBER 19 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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