095  
CDUS41 KLWX 280527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1227 AM EST THU JAN 28 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 27 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 44 2:36 PM 71 1974 43 1 50  
MINIMUM 33 11:59 PM -9 1987 24 9 31  
AVERAGE 39 34 5 41  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.95 1976 0.08 -0.08 0.00  
MONTH TO DATE 1.57 2.30 -0.73 3.33  
SINCE DEC 1 7.38 5.26 2.12 6.30  
SINCE JAN 1 1.57 2.30 -0.73 3.33  
 
SNOWFALL (IN)  
YESTERDAY 0.0 2.0 2009 0.3 -0.3 0.0  
MONTH TO DATE 0.2 6.1 -5.9 2.3  
SINCE DEC 1 2.6 9.6 -7.0 2.9  
SINCE JUL 1 2.6 10.1 -7.5 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 26 31 -5 24  
MONTH TO DATE 761 863 -102 689  
SINCE DEC 1 1563 1745 -182 1489  
SINCE JUL 1 2230 2661 -431 2352  
 
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 20 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 9.0  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 12:00 AM  
LOWEST 50 3:00 PM  
AVERAGE 75  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 68 2002  
MINIMUM TEMPERATURE (F) 24 -17 1987  
 
SUNRISE AND SUNSET  
JANUARY 28 2021.......SUNRISE 7:19 AM EST SUNSET 5:27 PM EST  
JANUARY 29 2021.......SUNRISE 7:18 AM EST SUNSET 5:28 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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