680  
CDUS41 KLWX 112122  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
422 PM EST FRI DEC 11 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 11 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 62 3:46 PM 71 1979 47 15 41  
MINIMUM 32 6:16 AM 3 1968 28 4 30  
AVERAGE 47 38 9 36  
 
PRECIPITATION (IN)  
TODAY 0.00 1.34 2008 0.10 -0.10 0.05  
MONTH TO DATE 0.99 1.19 -0.20 1.24  
SINCE DEC 1 0.99 1.19 -0.20 1.24  
SINCE JAN 1 44.64 39.77 4.87 39.08  
 
SNOWFALL (IN)  
TODAY 0.0 0.5 1962 0.1 -0.1 0.2  
MONTH TO DATE T 1.0 -1.0 0.2  
SINCE DEC 1 T 1.0 -1.0 0.2  
SINCE JUL 1 T 1.5 -1.5 0.2  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 18 27 -9 29  
MONTH TO DATE 269 284 -15 280  
SINCE DEC 1 269 284 -15 280  
SINCE JUL 1 936 1200 -264 1143  
 
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 S (190)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 6.5  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 6:00 AM  
LOWEST 44 3:00 PM  
AVERAGE 68  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 72 1979  
MINIMUM TEMPERATURE (F) 28 9 1988  
 
SUNRISE AND SUNSET  
DECEMBER 11 2020......SUNRISE 7:19 AM EST SUNSET 4:48 PM EST  
DECEMBER 12 2020......SUNRISE 7:20 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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