955  
CDUS41 KLWX 210531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1231 AM EST MON DEC 21 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 20 2020
 
 
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)  
YESTERDAY  
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)  
YESTERDAY 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)  
YESTERDAY 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 T  
 
DEGREE DAYS  
HEATING  
YESTERDAY 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  
YESTERDAY 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 4.9  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 11:00 PM  
LOWEST 73 1:00 PM  
AVERAGE 85  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 70 2013  
MINIMUM TEMPERATURE (F) 26 4 1989  
 
SUNRISE AND SUNSET  
DECEMBER 21 2020......SUNRISE 7:25 AM EST SUNSET 4:51 PM EST  
DECEMBER 22 2020......SUNRISE 7:26 AM EST SUNSET 4:52 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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