870  
CDUS41 KLWX 042123  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
423 PM EST FRI JAN 4 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 4 2019
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1960 TO 2019  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
TODAY  
MAXIMUM 46 356 PM 74 1997 42 4 28  
MINIMUM 28 444 AM 5 1979 24 4 13  
AVERAGE 37 33 4 21  
 
PRECIPITATION (IN)  
TODAY 0.00 0.89 1992 0.08 -0.08 0.02  
MONTH TO DATE 0.00 0.31 -0.31 0.02  
SINCE DEC 1 5.76 3.27 2.49 0.79  
SINCE JAN 1 0.00 0.31 -0.31 0.02  
 
SNOWFALL (IN)  
TODAY 0.0 1.8 1980 0.2 -0.2  
MONTH TO DATE 0.0 0.7 -0.7  
SINCE JUL 1 3.0 4.7 -1.7  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 28 32 -4 44  
MONTH TO DATE 91 128 -37 191  
SINCE DEC 1 895 1010 -115 1114  
SINCE JUL 1 1853 1926 -73 1908  
 
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 13 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 3.9  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
HAZE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 76 300 PM  
AVERAGE 88  
   
......................................................
 
 
 
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 2019.......SUNRISE 729 AM EST SUNSET 501 PM EST  
JANUARY 5 2019.......SUNRISE 729 AM EST SUNSET 502 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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