696  
CDUS41 KLWX 072129  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
429 PM EST MON DEC 07 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 7 2020
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
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)  
TODAY 0.00 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)  
TODAY 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  
TODAY 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  
TODAY 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 16 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 6.6  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT SNOW  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 78 5:00 AM  
LOWEST 50 2:00 PM  
AVERAGE 64  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 48 76 1980  
MINIMUM TEMPERATURE (F) 29 13 2002  
 
SUNRISE AND SUNSET  
DECEMBER 7 2020......SUNRISE 7:15 AM EST SUNSET 4:47 PM EST  
DECEMBER 8 2020......SUNRISE 7:16 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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