040  
CDUS41 KLWX 090524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1224 AM EST TUE FEB 09 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR FEBRUARY 8 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 38 4:40 PM 71 2017 45 -7 44  
MINIMUM 22 7:06 AM -6 1967 25 -3 27  
AVERAGE 30 35 -5 36  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.84 1997 0.10 -0.10 0.00  
MONTH TO DATE 0.60 0.79 -0.19 1.18  
SINCE DEC 1 8.29 6.43 1.86 7.48  
SINCE JAN 1 2.48 3.47 -0.99 4.51  
 
SNOWFALL (IN)  
YESTERDAY 0.0 6.8 1997 0.3 -0.3 0.0  
MONTH TO DATE 4.5 2.5 2.0 0.0  
SINCE DEC 1 10.1 13.3 -3.2 2.9  
SINCE JUL 1 10.1 13.8 -3.7 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 35 30 5 29  
MONTH TO DATE 236 245 -9 152  
SINCE DEC 1 1942 2113 -171 1756  
SINCE JUL 1 2609 3029 -420 2619  
 
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 13 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION N (20)  
AVERAGE WIND SPEED 6.3  
 
SKY COVER  
AVERAGE SKY COVER 0.2  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 63 11:00 PM  
LOWEST 39 1:00 AM  
AVERAGE 51  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 69 2001  
MINIMUM TEMPERATURE (F) 25 -5 1967  
 
SUNRISE AND SUNSET  
FEBRUARY 9 2021......SUNRISE 7:08 AM EST SUNSET 5:41 PM EST  
FEBRUARY 10 2021......SUNRISE 7:07 AM EST SUNSET 5:42 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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