360  
CDUS41 KLWX 310533  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1233 AM EST SUN JAN 31 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 30 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 39 3:59 PM 72 2013 43 -4 41  
MINIMUM 19 7:23 AM 2 1965 24 -5 23  
AVERAGE 29 34 -5 32  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.00 2013 0.09 -0.09 0.00  
MONTH TO DATE 1.57 2.58 -1.01 3.33  
SINCE DEC 1 7.38 5.54 1.84 6.30  
SINCE JAN 1 1.57 2.58 -1.01 3.33  
 
SNOWFALL (IN)  
YESTERDAY 0.0 6.3 2000 0.3 -0.3 0.0  
MONTH TO DATE 0.2 7.0 -6.8 2.3  
SINCE DEC 1 2.6 10.5 -7.9 2.9  
SINCE JUL 1 2.6 11.0 -8.4 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 36 31 5 33  
MONTH TO DATE 869 956 -87 775  
SINCE DEC 1 1671 1838 -167 1575  
SINCE JUL 1 2338 2754 -416 2438  
 
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 15 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 4.9  
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 65 8:00 AM  
LOWEST 31 4:00 PM  
AVERAGE 48  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 66 2012  
MINIMUM TEMPERATURE (F) 24 -7 1965  
 
SUNRISE AND SUNSET  
JANUARY 31 2021.......SUNRISE 7:17 AM EST SUNSET 5:30 PM EST  
FEBRUARY 1 2021......SUNRISE 7:16 AM EST SUNSET 5:31 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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