611  
CDUS41 KLWX 040522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1222 AM EST FRI DEC 04 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 3 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 53 2:34 PM 74 1998 50 3 47  
MINIMUM 25 7:20 AM 7 1976 30 -5 33  
AVERAGE 39 40 -1 40  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.14 1967 0.11 -0.11 0.00  
MONTH TO DATE 0.01 0.33 -0.32 0.40  
SINCE DEC 1 0.01 0.33 -0.32 0.40  
SINCE JAN 1 43.66 38.91 4.75 38.24  
 
SNOWFALL (IN)  
YESTERDAY 0.0 T 1983 0.0 0.0 0.0  
1989  
2005  
MONTH TO DATE 0.0 0.2 -0.2 T  
SINCE DEC 1 0.0 0.2 -0.2 T  
SINCE JUL 1 0.0 0.7 -0.7 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 26 25 1 25  
MONTH TO DATE 72 73 -1 74  
SINCE DEC 1 72 73 -1 74  
SINCE JUL 1 739 989 -250 937  
 
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 12 HIGHEST WIND DIRECTION S (180)  
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 2.6  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 81 7:00 AM  
LOWEST 27 3:00 PM  
AVERAGE 54  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 50 75 1998  
MINIMUM TEMPERATURE (F) 30 10 1966  
 
SUNRISE AND SUNSET  
DECEMBER 4 2020......SUNRISE 7:13 AM EST SUNSET 4:47 PM EST  
DECEMBER 5 2020......SUNRISE 7:14 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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