515  
CDUS41 KLWX 170521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1221 AM EST SUN JAN 17 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 16 2021
 
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
CLIMATE RECORD PERIOD: 1960 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 46 2:10 PM 65 1974 42 4 54  
MINIMUM 29 7:33 AM -4 1964 24 5 35  
AVERAGE 38 33 5 45  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.64 1991 0.08 -0.08 T  
MONTH TO DATE 1.25 1.33 -0.08 1.47  
SINCE DEC 1 7.06 4.29 2.77 4.44  
SINCE JAN 1 1.25 1.33 -0.08 1.47  
 
SNOWFALL (IN)  
YESTERDAY 0.0 2.3 1965 0.2 -0.2 T  
MONTH TO DATE 0.0 3.2 -3.2 2.0  
SINCE DEC 1 2.4 6.7 -4.3 2.6  
SINCE JUL 1 2.4 7.2 -4.8 2.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 27 32 -5 20  
MONTH TO DATE 437 512 -75 349  
SINCE DEC 1 1239 1394 -155 1149  
SINCE JUL 1 1906 2310 -404 2012  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 0 0 0 0    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 7.2  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 5:00 AM  
LOWEST 47 2:00 PM  
AVERAGE 72  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 70 1990  
MINIMUM TEMPERATURE (F) 24 -7 1982  
 
SUNRISE AND SUNSET  
JANUARY 17 2021.......SUNRISE 7:26 AM EST SUNSET 5:14 PM EST  
JANUARY 18 2021.......SUNRISE 7:26 AM EST SUNSET 5:15 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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