751  
CDUS41 KLWX 180520  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1220 AM EST THU FEB 18 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR FEBRUARY 17 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 36 4:17 PM 75 1976 47 -11 55  
MINIMUM 23 5:19 AM -4 1979 26 -3 30  
AVERAGE 30 36 -6 43  
 
PRECIPITATION (IN)  
YESTERDAY 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)  
YESTERDAY 0.0 4.1 1967 0.3 -0.3 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 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 35 29 6 22  
MONTH TO DATE 522 509 13 372  
SINCE DEC 1 2228 2377 -149 1976  
SINCE JUL 1 2895 3293 -398 2839  
 
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 18 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 8.1  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 68 11:00 PM  
LOWEST 40 3:00 PM  
AVERAGE 54  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 75 2011  
MINIMUM TEMPERATURE (F) 26 -14 1979  
 
SUNRISE AND SUNSET  
FEBRUARY 18 2021......SUNRISE 6:57 AM EST SUNSET 5:51 PM EST  
FEBRUARY 19 2021......SUNRISE 6:56 AM EST SUNSET 5:52 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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