366  
CDUS41 KLWX 110535  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1235 AM EST THU FEB 11 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR FEBRUARY 10 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 42 11:23 AM 63 1990 45 -3 47  
2001  
MINIMUM 29 4:12 AM -10 1979 25 4 41  
AVERAGE 36 35 1 44  
 
PRECIPITATION (IN)  
YESTERDAY 0.30 0.65 1970 0.10 0.20 0.40  
MONTH TO DATE 1.01 0.99 0.02 1.58  
SINCE DEC 1 8.70 6.63 2.07 7.88  
SINCE JAN 1 2.89 3.67 -0.78 4.91  
 
SNOWFALL (IN)  
YESTERDAY 0.5 7.1 2010 0.3 0.2 0.0  
MONTH TO DATE 5.0 3.1 1.9 0.0  
SINCE DEC 1 10.6 13.9 -3.3 2.9  
SINCE JUL 1 10.6 14.4 -3.8 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 29 30 -1 21  
MONTH TO DATE 292 305 -13 201  
SINCE DEC 1 1998 2173 -175 1805  
SINCE JUL 1 2665 3089 -424 2668  
 
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 12 HIGHEST WIND DIRECTION N (350)  
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION N (360)  
AVERAGE WIND SPEED 4.2  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
LIGHT SNOW  
SLEET  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 10:00 PM  
LOWEST 55 1:00 PM  
AVERAGE 78  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 71 2009  
MINIMUM TEMPERATURE (F) 25 -7 1979  
 
SUNRISE AND SUNSET  
FEBRUARY 11 2021......SUNRISE 7:05 AM EST SUNSET 5:43 PM EST  
FEBRUARY 12 2021......SUNRISE 7:04 AM EST SUNSET 5:44 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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