386  
CDUS41 KLWX 312125  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
425 PM EST THU DEC 31 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 31 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 51 10:42 AM 73 1992 43 8 53  
MINIMUM 42 3:59 PM 1 1993 24 18 41  
AVERAGE 47 34 13 47  
 
PRECIPITATION (IN)  
TODAY T 1.90 1975 0.07 -0.07 T  
MONTH TO DATE 5.81 2.96 2.85 2.97  
SINCE DEC 1 5.81 2.96 2.85 2.97  
SINCE JAN 1 49.46 41.54 7.92 40.81  
 
SNOWFALL (IN)  
TODAY 0.0 8.5 1970 0.1 -0.1 0.0  
MONTH TO DATE 2.4 3.5 -1.1 0.6  
SINCE DEC 1 2.4 3.5 -1.1 0.6  
SINCE JUL 1 2.4 4.0 -1.6 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 18 31 -13 18  
MONTH TO DATE 800 882 -82 800  
SINCE DEC 1 800 882 -82 800  
SINCE JUL 1 1467 1798 -331 1663  
 
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 24 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 10.3  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 82 8:00 AM  
LOWEST 56 1:00 PM  
AVERAGE 69  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 68 2005  
MINIMUM TEMPERATURE (F) 24 -6 1968  
 
SUNRISE AND SUNSET  
DECEMBER 31 2020......SUNRISE 7:28 AM EST SUNSET 4:58 PM EST  
JANUARY 1 2021.......SUNRISE 7:29 AM EST SUNSET 4:59 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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