854  
CDUS41 KLWX 282122  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
422 PM EST MON DEC 28 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 28 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 56 3:37 PM 73 1984 43 13 65  
MINIMUM 32 2:37 AM 8 1966 25 7 32  
AVERAGE 44 34 10 49  
 
PRECIPITATION (IN)  
TODAY 0.00 1.74 1967 0.08 -0.08 0.00  
MONTH TO DATE 5.81 2.73 3.08 2.34  
SINCE DEC 1 5.81 2.73 3.08 2.34  
SINCE JAN 1 49.46 41.31 8.15 40.18  
 
SNOWFALL (IN)  
TODAY 0.0 2.3 1993 0.2 -0.2 0.0  
MONTH TO DATE 2.4 3.1 -0.7 0.6  
SINCE DEC 1 2.4 3.1 -0.7 0.6  
SINCE JUL 1 2.4 3.6 -1.2 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 21 31 -10 16  
MONTH TO DATE 722 789 -67 752  
SINCE DEC 1 722 789 -67 752  
SINCE JUL 1 1389 1705 -316 1615  
 
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 S (200)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 10.6  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 79 12:00 AM  
LOWEST 41 2:00 PM  
AVERAGE 60  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 78 1984  
MINIMUM TEMPERATURE (F) 25 7 1977  
 
SUNRISE AND SUNSET  
DECEMBER 28 2020......SUNRISE 7:28 AM EST SUNSET 4:56 PM EST  
DECEMBER 29 2020......SUNRISE 7:28 AM EST SUNSET 4:56 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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