888  
CDUS41 KLWX 010540  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1240 AM EST MON FEB 01 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 31 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 32 2:50 PM 66 2012 44 -12 44  
MINIMUM 28 5:45 AM -7 1965 24 4 28  
AVERAGE 30 34 -4 36  
 
PRECIPITATION (IN)  
YESTERDAY 0.39 0.68 1985 0.10 0.29 T  
MONTH TO DATE 1.96 2.68 -0.72 3.33  
SINCE DEC 1 7.77 5.64 2.13 6.30  
SINCE JAN 1 1.96 2.68 -0.72 3.33  
 
SNOWFALL (IN)  
YESTERDAY 3.0 4.7 1985 0.3 2.7 0.0  
MONTH TO DATE 3.2 7.3 -4.1 2.3  
SINCE DEC 1 5.6 10.8 -5.2 2.9  
SINCE JUL 1 5.6 11.3 -5.7 2.9  
SNOW DEPTH 1  
 
DEGREE DAYS  
HEATING  
YESTERDAY 35 31 4 29  
MONTH TO DATE 904 987 -83 804  
SINCE DEC 1 1706 1869 -163 1604  
SINCE JUL 1 2373 2785 -412 2467  
 
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 17 HIGHEST WIND DIRECTION E (70)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION NE (60)  
AVERAGE WIND SPEED 7.7  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LT FREEZING RAIN  
SNOW  
LIGHT SNOW  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 1:00 PM  
LOWEST 47 12:00 AM  
AVERAGE 70  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 75 2002  
MINIMUM TEMPERATURE (F) 24 2 1965  
 
SUNRISE AND SUNSET  
FEBRUARY 1 2021......SUNRISE 7:16 AM EST SUNSET 5:31 PM EST  
FEBRUARY 2 2021......SUNRISE 7:15 AM EST SUNSET 5:33 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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