947  
CDUS41 KLWX 090523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST WED JAN 9 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 8 2019
 
 
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)  
YESTERDAY  
MAXIMUM 59 404 PM 70 2008 42 17 35  
MINIMUM 36 743 AM -4 1970 24 12 17  
AVERAGE 48 33 15 26  
 
PRECIPITATION (IN)  
YESTERDAY 0.11 1.07 1978 0.08 0.03 0.05  
MONTH TO DATE 0.25 0.65 -0.40 0.07  
SINCE DEC 1 6.01 3.61 2.40 0.84  
SINCE JAN 1 0.25 0.65 -0.40 0.07  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.7 1990 0.2 -0.2  
MONTH TO DATE 0.0 1.4 -1.4  
SINCE JUL 1 3.0 5.4 -2.4  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 17 32 -15 39  
MONTH TO DATE 179 256 -77 384  
SINCE DEC 1 983 1138 -155 1307  
SINCE JUL 1 1941 2054 -113 2101  
 
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 32 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 39 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 7.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 500 AM  
LOWEST 57 400 PM  
AVERAGE 79  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 64 2008  
MINIMUM TEMPERATURE (F) 24 -8 1970  
 
 
SUNRISE AND SUNSET  
JANUARY 9 2019.......SUNRISE 729 AM EST SUNSET 505 PM EST  
JANUARY 10 2019.......SUNRISE 728 AM EST SUNSET 506 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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