258  
CDUS41 KLWX 042124  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
424 PM EST MON JAN 04 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 4 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 44 3:17 PM 74 1997 42 2 58  
MINIMUM 28 7:25 AM 5 1979 24 4 43  
AVERAGE 36 33 3 51  
 
PRECIPITATION (IN)  
TODAY 0.00 0.89 1992 0.08 -0.08 0.35  
MONTH TO DATE 1.13 0.31 0.82 0.68  
SINCE DEC 1 6.94 3.27 3.67 3.65  
SINCE JAN 1 1.13 0.31 0.82 0.68  
 
SNOWFALL (IN)  
TODAY 0.0 1.8 1980 0.2 -0.2 0.0  
MONTH TO DATE 0.0 0.7 -0.7 0.0  
SINCE DEC 1 2.4 4.2 -1.8 0.6  
SINCE JUL 1 2.4 4.7 -2.3 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 29 32 -3 14  
MONTH TO DATE 103 128 -25 85  
SINCE DEC 1 905 1010 -105 885  
SINCE JUL 1 1572 1926 -354 1748  
 
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 10 HIGHEST WIND DIRECTION N (350)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 3.7  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 12:00 AM  
LOWEST 65 4:00 PM  
AVERAGE 81  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 69 1997  
MINIMUM TEMPERATURE (F) 24 5 1970  
 
SUNRISE AND SUNSET  
JANUARY 4 2021.......SUNRISE 7:29 AM EST SUNSET 5:01 PM EST  
JANUARY 5 2021.......SUNRISE 7:29 AM EST SUNSET 5:02 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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