523  
CDUS41 KLWX 230525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1225 AM EST WED DEC 23 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 22 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 2:08 PM 71 2013 44 5 49  
MINIMUM 34 11:59 PM 2 1989 26 8 19  
AVERAGE 42 35 7 34  
 
PRECIPITATION (IN)  
YESTERDAY T 1.12 2011 0.09 -0.09 0.00  
MONTH TO DATE 3.56 2.21 1.35 2.34  
SINCE DEC 1 3.56 2.21 1.35 2.34  
SINCE JAN 1 47.21 40.79 6.42 40.18  
 
SNOWFALL (IN)  
YESTERDAY 0.0 3.3 1962 0.1 -0.1 0.0  
MONTH TO DATE 2.4 2.2 0.2 0.6  
SINCE DEC 1 2.4 2.2 0.2 0.6  
SINCE JUL 1 2.4 2.7 -0.3 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 23 30 -7 31  
MONTH TO DATE 562 604 -42 614  
SINCE DEC 1 562 604 -42 614  
SINCE JUL 1 1229 1520 -291 1477  
 
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 33 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 44 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 12.4  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 12:00 AM  
LOWEST 46 2:00 PM  
AVERAGE 70  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 68 1990  
MINIMUM TEMPERATURE (F) 25 4 1989  
 
SUNRISE AND SUNSET  
DECEMBER 23 2020......SUNRISE 7:26 AM EST SUNSET 4:52 PM EST  
DECEMBER 24 2020......SUNRISE 7:26 AM EST SUNSET 4:53 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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