016  
CDUS41 KLWX 132124  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
424 PM EST SUN DEC 13 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 13 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 65 1:13 PM 73 2015 46 19 38  
MINIMUM 47 7:40 AM 7 1988 28 19 33  
AVERAGE 56 37 19 36  
 
PRECIPITATION (IN)  
TODAY 0.00 1.47 1996 0.09 -0.09 0.25  
MONTH TO DATE 0.99 1.39 -0.40 1.49  
SINCE DEC 1 0.99 1.39 -0.40 1.49  
SINCE JAN 1 44.64 39.97 4.67 39.33  
 
SNOWFALL (IN)  
TODAY 0.0 8.8 1966 0.1 -0.1 0.0  
MONTH TO DATE T 1.2 -1.2 0.2  
SINCE DEC 1 T 1.2 -1.2 0.2  
SINCE JUL 1 T 1.7 -1.7 0.2  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 9 28 -19 29  
MONTH TO DATE 292 340 -48 343  
SINCE DEC 1 292 340 -48 343  
SINCE JUL 1 959 1256 -297 1206  
 
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 15 HIGHEST WIND DIRECTION N (340)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 8.0  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 86 6:00 AM  
LOWEST 43 2:00 PM  
AVERAGE 65  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 46 69 2015  
MINIMUM TEMPERATURE (F) 27 3 1989  
 
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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