095  
CDUS41 KLWX 130524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1224 AM EST SUN DEC 13 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 12 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 65 3:09 PM 72 1979 47 18 39  
MINIMUM 36 7:35 AM 9 1988 28 8 23  
AVERAGE 51 37 14 31  
 
PRECIPITATION (IN)  
YESTERDAY T 0.95 1964 0.11 -0.11 0.00  
MONTH TO DATE 0.99 1.30 -0.31 1.24  
SINCE DEC 1 0.99 1.30 -0.31 1.24  
SINCE JAN 1 44.64 39.88 4.76 39.08  
 
SNOWFALL (IN)  
YESTERDAY 0.0 10.6 1982 0.1 -0.1 0.0  
MONTH TO DATE T 1.1 -1.1 0.2  
SINCE DEC 1 T 1.1 -1.1 0.2  
SINCE JUL 1 T 1.6 -1.6 0.2  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 14 28 -14 34  
MONTH TO DATE 283 312 -29 314  
SINCE DEC 1 283 312 -29 314  
SINCE JUL 1 950 1228 -278 1177  
 
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 21 HIGHEST WIND DIRECTION SW (220)  
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION SW (220)  
AVERAGE WIND SPEED 6.9  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 8:00 AM  
LOWEST 47 3:00 PM  
AVERAGE 72  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 46 73 2015  
MINIMUM TEMPERATURE (F) 28 7 1988  
 
SUNRISE AND SUNSET  
DECEMBER 13 2020......SUNRISE 7:20 AM EST SUNSET 4:48 PM EST  
DECEMBER 14 2020......SUNRISE 7:21 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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