887  
CDUS41 KLWX 090531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1231 AM EST WED DEC 09 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 8 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 2:44 PM 76 1980 48 -3 47  
MINIMUM 31 6:13 AM 13 2002 29 2 20  
AVERAGE 38 38 0 34  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.24 1972 0.10 -0.10 0.00  
MONTH TO DATE 0.99 0.87 0.12 0.46  
SINCE DEC 1 0.99 0.87 0.12 0.46  
SINCE JAN 1 44.64 39.45 5.19 38.30  
 
SNOWFALL (IN)  
YESTERDAY 0.0 5.0 1989 0.1 -0.1 0.0  
MONTH TO DATE T 0.7 -0.7 T  
SINCE DEC 1 T 0.7 -0.7 T  
SINCE JUL 1 T 1.2 -1.2 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 27 27 0 31  
MONTH TO DATE 195 203 -8 212  
SINCE DEC 1 195 203 -8 212  
SINCE JUL 1 862 1119 -257 1075  
 
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 33 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 14.1  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 63 8:00 PM  
LOWEST 40 3:00 PM  
AVERAGE 52  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 48 72 1978  
MINIMUM TEMPERATURE (F) 29 11 1989  
 
SUNRISE AND SUNSET  
DECEMBER 9 2020......SUNRISE 7:17 AM EST SUNSET 4:48 PM EST  
DECEMBER 10 2020......SUNRISE 7:18 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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