449  
CDUS41 KLWX 250525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1225 AM EST FRI DEC 25 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 24 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 61 10:09 PM 71 2015 44 17 52  
MINIMUM 43 3:51 AM 1 1983 25 18 27  
AVERAGE 52 34 18 40  
 
PRECIPITATION (IN)  
YESTERDAY 1.94 2.01 1986 0.09 1.85 0.00  
MONTH TO DATE 5.50 2.39 3.11 2.34  
SINCE DEC 1 5.50 2.39 3.11 2.34  
SINCE JAN 1 49.15 40.97 8.18 40.18  
 
SNOWFALL (IN)  
YESTERDAY 0.0 8.3 1966 0.2 -0.2 0.0  
MONTH TO DATE 2.4 2.5 -0.1 0.6  
SINCE DEC 1 2.4 2.5 -0.1 0.6  
SINCE JUL 1 2.4 3.0 -0.6 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 13 31 -18 25  
MONTH TO DATE 603 665 -62 665  
SINCE DEC 1 603 665 -62 665  
SINCE JUL 1 1270 1581 -311 1528  
 
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 24 HIGHEST WIND DIRECTION SW (220)  
HIGHEST GUST SPEED 37 HIGHEST GUST DIRECTION SW (240)  
AVERAGE WIND SPEED 7.6  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 11:00 PM  
LOWEST 63 1:00 AM  
AVERAGE 80  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 71 1964  
1982  
MINIMUM TEMPERATURE (F) 25 -4 1989  
 
SUNRISE AND SUNSET  
DECEMBER 25 2020......SUNRISE 7:27 AM EST SUNSET 4:54 PM EST  
DECEMBER 26 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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