055  
CDUS41 KLWX 070524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1224 AM EST MON DEC 07 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 6 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 45 1:35 PM 79 1998 49 -4 50  
MINIMUM 31 11:42 PM 9 2002 29 2 31  
AVERAGE 38 39 -1 41  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.03 2016 0.11 -0.11 T  
MONTH TO DATE 0.99 0.66 0.33 0.46  
SINCE DEC 1 0.99 0.66 0.33 0.46  
SINCE JAN 1 44.64 39.24 5.40 38.30  
 
SNOWFALL (IN)  
YESTERDAY 0.0 1.0 2003 0.1 -0.1 0.0  
MONTH TO DATE 0.0 0.5 -0.5 T  
SINCE DEC 1 0.0 0.5 -0.5 T  
SINCE JUL 1 0.0 1.0 -1.0 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 27 26 1 24  
MONTH TO DATE 137 150 -13 150  
SINCE DEC 1 137 150 -13 150  
SINCE JUL 1 804 1066 -262 1013  
 
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 20 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 11.4  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 64 9:00 PM  
LOWEST 47 2:00 PM  
AVERAGE 56  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 49 77 1998  
MINIMUM TEMPERATURE (F) 29 1 2002  
 
SUNRISE AND SUNSET  
DECEMBER 7 2020......SUNRISE 7:15 AM EST SUNSET 4:47 PM EST  
DECEMBER 8 2020......SUNRISE 7:16 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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