497  
CDUS41 KLWX 092122  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
422 PM EST SAT JAN 09 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 9 2021
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 46 3:26 PM 64 2008 42 4 39  
MINIMUM 30 6:47 AM -8 1970 24 6 24  
AVERAGE 38 33 5 32  
 
PRECIPITATION (IN)  
TODAY 0.00 1.39 1964 0.08 -0.08 0.00  
MONTH TO DATE 1.14 0.73 0.41 1.00  
SINCE DEC 1 6.95 3.69 3.26 3.97  
SINCE JAN 1 1.14 0.73 0.41 1.00  
 
SNOWFALL (IN)  
TODAY 0.0 3.5 1997 0.2 -0.2 0.0  
MONTH TO DATE 0.0 1.6 -1.6 2.0  
SINCE DEC 1 2.4 5.1 -2.7 2.6  
SINCE JUL 1 2.4 5.6 -3.2 2.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 27 32 -5 33  
MONTH TO DATE 241 288 -47 236  
SINCE DEC 1 1043 1170 -127 1036  
SINCE JUL 1 1710 2086 -376 1899  
 
COOLING  
TODAY 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 21 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 30 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 13.0  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 66 12:00 AM  
LOWEST 30 1:00 PM  
AVERAGE 48  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 59 2016  
MINIMUM TEMPERATURE (F) 24 0 1982  
 
SUNRISE AND SUNSET  
JANUARY 9 2021.......SUNRISE 7:28 AM EST SUNSET 5:06 PM EST  
JANUARY 10 2021.......SUNRISE 7:28 AM EST SUNSET 5:07 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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