170  
CDUS41 KLWX 172126  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
426 PM EST WED FEB 17 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR FEBRUARY 17 2021
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 35 3:59 PM 75 1976 47 -12 55  
MINIMUM 23 5:19 AM -4 1979 26 -3 30  
AVERAGE 29 36 -7 43  
 
PRECIPITATION (IN)  
TODAY 0.00 1.36 1998 0.10 -0.10 0.00  
MONTH TO DATE 2.01 1.68 0.33 2.13  
SINCE DEC 1 9.70 7.32 2.38 8.43  
SINCE JAN 1 3.89 4.36 -0.47 5.46  
 
SNOWFALL (IN)  
TODAY MM 4.1 1967 0.3 MM 0.0  
MONTH TO DATE 5.2 5.1 0.1 T  
SINCE DEC 1 10.8 15.9 -5.1 2.9  
SINCE JUL 1 10.8 16.4 -5.6 2.9  
SNOW DEPTH MM  
 
DEGREE DAYS  
HEATING  
TODAY 36 29 7 22  
MONTH TO DATE 523 509 14 372  
SINCE DEC 1 2229 2377 -148 1976  
SINCE JUL 1 2896 3293 -397 2839  
 
COOLING  
TODAY 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 18 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 10.3  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 62 5:00 AM  
LOWEST 40 3:00 PM  
AVERAGE 51  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 75 2011  
MINIMUM TEMPERATURE (F) 26 -14 1979  
 
SUNRISE AND SUNSET  
FEBRUARY 17 2021......SUNRISE 6:58 AM EST SUNSET 5:50 PM EST  
FEBRUARY 18 2021......SUNRISE 6:57 AM EST SUNSET 5:51 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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