769  
CDUS41 KLWX 202123  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
423 PM EST SUN DEC 20 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 20 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 46 2:38 PM 64 1988 45 1 40  
MINIMUM 32 5:10 AM 8 1991 26 6 18  
AVERAGE 39 35 4 29  
 
PRECIPITATION (IN)  
TODAY 0.00 0.66 1973 0.08 -0.08 0.00  
MONTH TO DATE 3.54 2.03 1.51 2.34  
SINCE DEC 1 3.54 2.03 1.51 2.34  
SINCE JAN 1 47.19 40.61 6.58 40.18  
 
SNOWFALL (IN)  
TODAY 0.0 4.3 1966 0.1 -0.1 0.0  
MONTH TO DATE 2.4 2.0 0.4 0.6  
SINCE DEC 1 2.4 2.0 0.4 0.6  
SINCE JUL 1 2.4 2.5 -0.1 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 26 30 -4 36  
MONTH TO DATE 514 544 -30 549  
SINCE DEC 1 514 544 -30 549  
SINCE JUL 1 1181 1460 -279 1412  
 
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 S (190)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 5.3  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 88 5:00 AM  
LOWEST 73 1:00 PM  
AVERAGE 81  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 70 2013  
MINIMUM TEMPERATURE (F) 26 4 1989  
 
SUNRISE AND SUNSET  
DECEMBER 20 2020......SUNRISE 7:25 AM EST SUNSET 4:51 PM EST  
DECEMBER 21 2020......SUNRISE 7:25 AM EST SUNSET 4:51 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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