451  
CDUS41 KLWX 152151  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
451 PM EST TUE DEC 15 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 15 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 41 2:43 PM 71 1971 46 -5 53  
MINIMUM 27 6:42 AM 5 1989 27 0 35  
AVERAGE 34 36 -2 44  
 
PRECIPITATION (IN)  
TODAY 0.00 2.49 2018 0.09 -0.09 T  
MONTH TO DATE 2.23 1.58 0.65 1.81  
SINCE DEC 1 2.23 1.58 0.65 1.81  
SINCE JAN 1 45.88 40.16 5.72 39.65  
 
SNOWFALL (IN)  
TODAY 0.0 4.7 1981 0.1 -0.1 T  
MONTH TO DATE T 1.5 -1.5 0.2  
SINCE DEC 1 T 1.5 -1.5 0.2  
SINCE JUL 1 T 2.0 -2.0 0.2  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 31 29 2 21  
MONTH TO DATE 353 397 -44 385  
SINCE DEC 1 353 397 -44 385  
SINCE JUL 1 1020 1313 -293 1248  
 
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 14 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 6.9  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 77 3:00 AM  
LOWEST 44 11:00 AM  
AVERAGE 61  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 46 72 1971  
MINIMUM TEMPERATURE (F) 27 9 2016  
 
SUNRISE AND SUNSET  
DECEMBER 15 2020......SUNRISE 7:22 AM EST SUNSET 4:49 PM EST  
DECEMBER 16 2020......SUNRISE 7:22 AM EST SUNSET 4:49 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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