346  
CDUS41 KLWX 092130  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
430 PM EST WED DEC 09 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 9 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 44 3:56 PM 72 1978 48 -4 52  
MINIMUM 26 6:33 AM 11 1989 29 -3 36  
AVERAGE 35 38 -3 44  
 
PRECIPITATION (IN)  
TODAY 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)  
TODAY 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  
TODAY 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  
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 13 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 4.8  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 78 7:00 AM  
LOWEST 45 3:00 PM  
AVERAGE 62  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 70 1966  
MINIMUM TEMPERATURE (F) 28 4 1989  
 
SUNRISE AND SUNSET  
DECEMBER 9 2020......SUNRISE 7:17 AM EST SUNSET 4:48 PM EST  
DECEMBER 10 2020......SUNRISE 7:18 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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