499  
CDUS41 KLWX 120524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1224 AM EST SAT DEC 12 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 11 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 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)  
YESTERDAY 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)  
YESTERDAY 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  
YESTERDAY 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  
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 S (190)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 6.3  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 6:00 AM  
LOWEST 44 3:00 PM  
AVERAGE 68  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 72 1979  
MINIMUM TEMPERATURE (F) 28 9 1988  
 
SUNRISE AND SUNSET  
DECEMBER 12 2020......SUNRISE 7:20 AM EST SUNSET 4:48 PM EST  
DECEMBER 13 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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