618  
CDUS41 KLWX 070524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1224 AM EST THU JAN 07 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 6 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 41 3:58 PM 71 2007 42 -1 53  
MINIMUM 34 11:10 PM 4 1977 24 10 27  
1999  
AVERAGE 38 33 5 40  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.94 1995 0.08 -0.08 0.00  
MONTH TO DATE 1.14 0.48 0.66 0.68  
SINCE DEC 1 6.95 3.44 3.51 3.65  
SINCE JAN 1 1.14 0.48 0.66 0.68  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.2 2015 0.2 -0.2 0.0  
MONTH TO DATE 0.0 1.0 -1.0 0.0  
SINCE DEC 1 2.4 4.5 -2.1 0.6  
SINCE JUL 1 2.4 5.0 -2.6 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 27 32 -5 25  
MONTH TO DATE 156 192 -36 140  
SINCE DEC 1 958 1074 -116 940  
SINCE JUL 1 1625 1990 -365 1803  
 
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 22 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 10.4  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 79 12:00 AM  
LOWEST 57 4:00 PM  
AVERAGE 68  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 71 2008  
MINIMUM TEMPERATURE (F) 24 -1 2018  
 
SUNRISE AND SUNSET  
JANUARY 7 2021.......SUNRISE 7:29 AM EST SUNSET 5:04 PM EST  
JANUARY 8 2021.......SUNRISE 7:29 AM EST SUNSET 5:05 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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