502  
CDUS41 KLWX 182126  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
426 PM EST FRI DEC 18 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 18 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 37 3:59 PM 76 2006 45 -8 40  
MINIMUM 31 8:24 AM 3 1989 26 5 25  
AVERAGE 34 36 -2 33  
 
PRECIPITATION (IN)  
TODAY T 2.92 1977 0.09 -0.09 T  
MONTH TO DATE 3.54 1.86 1.68 2.34  
SINCE DEC 1 3.54 1.86 1.68 2.34  
SINCE JAN 1 47.19 40.44 6.75 40.18  
 
SNOWFALL (IN)  
TODAY 0.1 2.0 2009 0.1 0.0 T  
MONTH TO DATE 2.4 1.8 0.6 0.6  
SINCE DEC 1 2.4 1.8 0.6 0.6  
SINCE JUL 1 2.4 2.3 0.1 0.6  
SNOW DEPTH 1  
 
DEGREE DAYS  
HEATING  
TODAY 31 29 2 32  
MONTH TO DATE 451 484 -33 475  
SINCE DEC 1 451 484 -33 475  
SINCE JUL 1 1118 1400 -282 1338  
 
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 8 HIGHEST WIND DIRECTION NE (30)  
HIGHEST GUST SPEED 10 HIGHEST GUST DIRECTION NE (30)  
AVERAGE WIND SPEED 3.3  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT SNOW  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 89 6:00 AM  
LOWEST 72 2:00 AM  
AVERAGE 81  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 63 1967  
MINIMUM TEMPERATURE (F) 26 -2 1989  
 
SUNRISE AND SUNSET  
DECEMBER 18 2020......SUNRISE 7:24 AM EST SUNSET 4:50 PM EST  
DECEMBER 19 2020......SUNRISE 7:24 AM EST SUNSET 4:50 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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