994  
CDUS41 KLWX 100523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST WED FEB 10 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR FEBRUARY 9 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 49 3:08 PM 69 2001 45 4 49  
MINIMUM 27 12:49 AM -5 1967 25 2 24  
AVERAGE 38 35 3 37  
 
PRECIPITATION (IN)  
YESTERDAY T 1.07 1970 0.10 -0.10 0.00  
MONTH TO DATE 0.71 0.89 -0.18 1.18  
SINCE DEC 1 8.40 6.53 1.87 7.48  
SINCE JAN 1 2.59 3.57 -0.98 4.51  
 
SNOWFALL (IN)  
YESTERDAY 0.0 2.2 2010 0.3 -0.3 0.0  
MONTH TO DATE 4.5 2.8 1.7 0.0  
SINCE DEC 1 10.1 13.6 -3.5 2.9  
SINCE JUL 1 10.1 14.1 -4.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 27 30 -3 28  
MONTH TO DATE 263 275 -12 180  
SINCE DEC 1 1969 2143 -174 1784  
SINCE JUL 1 2636 3059 -423 2647  
 
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 N (350)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 6.4  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 78 7:00 AM  
LOWEST 49 3:00 PM  
AVERAGE 64  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 63 1990  
2001  
MINIMUM TEMPERATURE (F) 25 -10 1979  
 
SUNRISE AND SUNSET  
FEBRUARY 10 2021......SUNRISE 7:07 AM EST SUNSET 5:42 PM EST  
FEBRUARY 11 2021......SUNRISE 7:05 AM EST SUNSET 5:43 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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