458  
CDUS41 KLWX 110523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST FRI DEC 11 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 10 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 54 1:08 PM 70 1966 47 7 56  
MINIMUM 24 6:25 AM 4 1989 28 -4 37  
AVERAGE 39 38 1 47  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.26 1992 0.11 -0.11 0.21  
MONTH TO DATE 0.99 1.09 -0.10 1.19  
SINCE DEC 1 0.99 1.09 -0.10 1.19  
SINCE JAN 1 44.64 39.67 4.97 39.03  
 
SNOWFALL (IN)  
YESTERDAY 0.0 2.6 1992 0.1 -0.1 T  
MONTH TO DATE T 0.9 -0.9 T  
SINCE DEC 1 T 0.9 -0.9 T  
SINCE JUL 1 T 1.4 -1.4 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 26 27 -1 18  
MONTH TO DATE 251 257 -6 251  
SINCE DEC 1 251 257 -6 251  
SINCE JUL 1 918 1173 -255 1114  
 
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 9 HIGHEST WIND DIRECTION S (180)  
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 2.9  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 11:00 PM  
LOWEST 52 1:00 PM  
AVERAGE 72  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 71 1979  
MINIMUM TEMPERATURE (F) 28 3 1968  
 
SUNRISE AND SUNSET  
DECEMBER 11 2020......SUNRISE 7:19 AM EST SUNSET 4:48 PM EST  
DECEMBER 12 2020......SUNRISE 7:20 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.  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab VA Page
The Nexlab MD Page
The Nexlab WV Page Main Text Page