362  
CDUS41 KLWX 050523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST SAT DEC 05 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 4 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 50 3:27 PM 75 1998 50 0 48  
MINIMUM 44 11:59 PM 10 1966 30 14 32  
AVERAGE 47 40 7 40  
 
PRECIPITATION (IN)  
YESTERDAY 0.39 1.18 1993 0.11 0.28 0.05  
MONTH TO DATE 0.40 0.44 -0.04 0.45  
SINCE DEC 1 0.40 0.44 -0.04 0.45  
SINCE JAN 1 44.05 39.02 5.03 38.29  
 
SNOWFALL (IN)  
YESTERDAY 0.0 T 2014 0.1 -0.1 T  
2016  
2019  
MONTH TO DATE 0.0 0.3 -0.3 T  
SINCE DEC 1 0.0 0.3 -0.3 T  
SINCE JUL 1 0.0 0.8 -0.8 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 18 25 -7 25  
MONTH TO DATE 90 98 -8 99  
SINCE DEC 1 90 98 -8 99  
SINCE JUL 1 757 1014 -257 962  
 
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 17 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 5.4  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 10:00 PM  
LOWEST 48 12:00 AM  
AVERAGE 73  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 49 77 2001  
MINIMUM TEMPERATURE (F) 30 12 1966  
 
SUNRISE AND SUNSET  
DECEMBER 5 2020......SUNRISE 7:14 AM EST SUNSET 4:47 PM EST  
DECEMBER 6 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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