873  
CDUS41 KLWX 100533  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1233 AM EST THU DEC 10 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 9 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 44 4:04 PM 72 1978 48 -4 52  
MINIMUM 26 6:33 AM 11 1989 29 -3 36  
AVERAGE 35 38 -3 44  
 
PRECIPITATION (IN)  
YESTERDAY T 1.12 1973 0.11 -0.11 0.52  
MONTH TO DATE 0.99 0.98 0.01 0.98  
SINCE DEC 1 0.99 0.98 0.01 0.98  
SINCE JAN 1 44.64 39.56 5.08 38.82  
 
SNOWFALL (IN)  
YESTERDAY T 4.0 2017 0.1 -0.1 0.0  
MONTH TO DATE T 0.8 -0.8 T  
SINCE DEC 1 T 0.8 -0.8 T  
SINCE JUL 1 T 1.3 -1.3 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 30 27 3 21  
MONTH TO DATE 225 230 -5 233  
SINCE DEC 1 225 230 -5 233  
SINCE JUL 1 892 1146 -254 1096  
 
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 13 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 3.2  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT SNOW  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 88 10:00 PM  
LOWEST 45 3:00 PM  
AVERAGE 67  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 70 1966  
MINIMUM TEMPERATURE (F) 28 4 1989  
 
SUNRISE AND SUNSET  
DECEMBER 10 2020......SUNRISE 7:18 AM EST SUNSET 4:48 PM EST  
DECEMBER 11 2020......SUNRISE 7:19 AM EST SUNSET 4:48 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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