121  
CDUS41 KLWX 060525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1225 AM EST SUN DEC 06 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 5 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 48 12:38 PM 77 2001 49 -1 46  
MINIMUM 41 11:59 PM 12 1966 30 11 30  
AVERAGE 45 40 5 38  
 
PRECIPITATION (IN)  
YESTERDAY 0.59 1.02 2003 0.11 0.48 0.01  
MONTH TO DATE 0.99 0.55 0.44 0.46  
SINCE DEC 1 0.99 0.55 0.44 0.46  
SINCE JAN 1 44.64 39.13 5.51 38.30  
 
SNOWFALL (IN)  
YESTERDAY 0.0 6.2 2002 0.1 -0.1 0.0  
MONTH TO DATE 0.0 0.4 -0.4 T  
SINCE DEC 1 0.0 0.4 -0.4 T  
SINCE JUL 1 0.0 0.9 -0.9 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 20 26 -6 27  
MONTH TO DATE 110 124 -14 126  
SINCE DEC 1 110 124 -14 126  
SINCE JUL 1 777 1040 -263 989  
 
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 25 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 36 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 14.9  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 12:00 AM  
LOWEST 47 4:00 PM  
AVERAGE 72  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 49 79 1998  
MINIMUM TEMPERATURE (F) 29 9 2002  
 
SUNRISE AND SUNSET  
DECEMBER 6 2020......SUNRISE 7:15 AM EST SUNSET 4:47 PM EST  
DECEMBER 7 2020......SUNRISE 7:15 AM EST SUNSET 4:47 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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