604  
CDUS41 KLWX 240523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST THU DEC 24 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 23 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 49 3:50 PM 68 1990 44 5 55  
MINIMUM 25 4:24 AM 4 1989 25 0 23  
AVERAGE 37 35 2 39  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.30 2004 0.09 -0.09 0.00  
MONTH TO DATE 3.56 2.30 1.26 2.34  
SINCE DEC 1 3.56 2.30 1.26 2.34  
SINCE JAN 1 47.21 40.88 6.33 40.18  
 
SNOWFALL (IN)  
YESTERDAY 0.0 7.5 1963 0.1 -0.1 0.0  
MONTH TO DATE 2.4 2.3 0.1 0.6  
SINCE DEC 1 2.4 2.3 0.1 0.6  
SINCE JUL 1 2.4 2.8 -0.4 0.6  
SNOW DEPTH MM  
 
DEGREE DAYS  
HEATING  
YESTERDAY 28 30 -2 26  
MONTH TO DATE 590 634 -44 640  
SINCE DEC 1 590 634 -44 640  
SINCE JUL 1 1257 1550 -293 1503  
 
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 17 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 6.0  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 8:00 AM  
LOWEST 47 2:00 PM  
AVERAGE 70  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 71 2015  
MINIMUM TEMPERATURE (F) 25 1 1983  
 
SUNRISE AND SUNSET  
DECEMBER 24 2020......SUNRISE 7:26 AM EST SUNSET 4:53 PM EST  
DECEMBER 25 2020......SUNRISE 7:27 AM EST SUNSET 4:54 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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