181  
CDUS41 KLWX 190533  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1233 AM EST SAT DEC 19 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 18 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 37 6:49 PM 76 2006 45 -8 40  
MINIMUM 27 11:59 PM 3 1989 26 1 25  
AVERAGE 32 36 -4 33  
 
PRECIPITATION (IN)  
YESTERDAY T 2.92 1977 0.09 -0.09 T  
MONTH TO DATE 3.54 1.86 1.68 2.34  
SINCE DEC 1 3.54 1.86 1.68 2.34  
SINCE JAN 1 47.19 40.44 6.75 40.18  
 
SNOWFALL (IN)  
YESTERDAY T 2.0 2009 0.1 -0.1 T  
MONTH TO DATE 2.3 1.8 0.5 0.6  
SINCE DEC 1 2.3 1.8 0.5 0.6  
SINCE JUL 1 2.3 2.3 -0.0 0.6  
SNOW DEPTH 1  
 
DEGREE DAYS  
HEATING  
YESTERDAY 33 29 4 32  
MONTH TO DATE 453 484 -31 475  
SINCE DEC 1 453 484 -31 475  
SINCE JUL 1 1120 1400 -280 1338  
 
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 12 HIGHEST WIND DIRECTION N (340)  
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION N (360)  
AVERAGE WIND SPEED 4.3  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT SNOW  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 89 6:00 AM  
LOWEST 66 10:00 PM  
AVERAGE 78  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 63 1967  
MINIMUM TEMPERATURE (F) 26 -2 1989  
 
SUNRISE AND SUNSET  
DECEMBER 19 2020......SUNRISE 7:24 AM EST SUNSET 4:50 PM EST  
DECEMBER 20 2020......SUNRISE 7:25 AM EST SUNSET 4:51 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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