461  
CDUS41 KLWX 302124  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
424 PM EST WED DEC 30 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 30 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 45 3:32 PM 67 1990 43 2 63  
MINIMUM 26 12:08 AM 4 1963 25 1 45  
AVERAGE 36 34 2 54  
 
PRECIPITATION (IN)  
TODAY 0.00 0.87 1969 0.08 -0.08 0.18  
MONTH TO DATE 5.81 2.89 2.92 2.97  
SINCE DEC 1 5.81 2.89 2.92 2.97  
SINCE JAN 1 49.46 41.47 7.99 40.81  
 
SNOWFALL (IN)  
TODAY 0.0 0.9 1977 0.2 -0.2 0.0  
MONTH TO DATE 2.4 3.4 -1.0 0.6  
SINCE DEC 1 2.4 3.4 -1.0 0.6  
SINCE JUL 1 2.4 3.9 -1.5 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 29 31 -2 11  
MONTH TO DATE 783 851 -68 782  
SINCE DEC 1 783 851 -68 782  
SINCE JUL 1 1450 1767 -317 1645  
 
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 21 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 7.8  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 81 4:00 AM  
LOWEST 40 3:00 PM  
AVERAGE 61  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 73 1992  
MINIMUM TEMPERATURE (F) 24 1 1993  
 
SUNRISE AND SUNSET  
DECEMBER 30 2020......SUNRISE 7:28 AM EST SUNSET 4:57 PM EST  
DECEMBER 31 2020......SUNRISE 7:28 AM EST SUNSET 4:58 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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