852  
CDUS41 KLWX 080529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1229 AM EST TUE DEC 08 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 7 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 40 2:59 PM 77 1998 49 -9 44  
MINIMUM 28 3:22 AM 1 2002 29 -1 24  
AVERAGE 34 39 -5 34  
 
PRECIPITATION (IN)  
YESTERDAY T 2.14 2011 0.11 -0.11 0.00  
MONTH TO DATE 0.99 0.77 0.22 0.46  
SINCE DEC 1 0.99 0.77 0.22 0.46  
SINCE JAN 1 44.64 39.35 5.29 38.30  
 
SNOWFALL (IN)  
YESTERDAY T 1.6 1969 0.1 -0.1 0.0  
MONTH TO DATE T 0.6 -0.6 T  
SINCE DEC 1 T 0.6 -0.6 T  
SINCE JUL 1 T 1.1 -1.1 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 31 26 5 31  
MONTH TO DATE 168 176 -8 181  
SINCE DEC 1 168 176 -8 181  
SINCE JUL 1 835 1092 -257 1044  
 
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 18 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 30 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 8.7  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT SNOW  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 78 5:00 AM  
LOWEST 50 2:00 PM  
AVERAGE 64  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 48 76 1980  
MINIMUM TEMPERATURE (F) 29 13 2002  
 
SUNRISE AND SUNSET  
DECEMBER 8 2020......SUNRISE 7:16 AM EST SUNSET 4:47 PM EST  
DECEMBER 9 2020......SUNRISE 7:17 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