990  
CDUS41 KLWX 210531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1231 AM EST TUE JAN 21 2025  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 20 2025
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1960 TO 2025  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 25 12:22 AM 63 2006 42 -17 26  
MINIMUM 12 11:59 PM -7 1985 25 -13 12  
AVERAGE 19 34 -15 19  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.01 1979 0.10 -0.10 T  
MONTH TO DATE 1.15 1.89 -0.74 4.31  
SINCE DEC 1 4.49 5.19 -0.70 10.06  
SINCE JAN 1 1.15 1.89 -0.74 4.31  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.6 2000 0.2 -0.2 0.2  
MONTH TO DATE 10.5 3.9 6.6 9.5  
SINCE DEC 1 10.6 6.7 3.9 10.0  
SINCE JUL 1 10.6 7.0 3.6 10.0  
SNOW DEPTH 1  
 
DEGREE DAYS  
HEATING  
YESTERDAY 46 31 15 46  
MONTH TO DATE 695 616 79 611  
SINCE DEC 1 1524 1461 63 1286  
SINCE JUL 1 2192 2361 -169 2057  
 
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 22 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 10.5  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 71 1:00 AM  
LOWEST 45 5:00 PM  
AVERAGE 58  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 63 2018  
MINIMUM TEMPERATURE (F) 25 -16 1984  
 
SUNRISE AND SUNSET  
JANUARY 21 2025.......SUNRISE 7:24 AM EST SUNSET 5:19 PM EST  
JANUARY 22 2025.......SUNRISE 7:23 AM EST SUNSET 5:20 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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