669  
CDUS41 KLWX 140543  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1240 AM EST THU DEC 14 2017  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 13 2017
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1960 TO 2017  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 34 1159 PM 73 2015 46 -12 46  
MINIMUM 20 755 AM 7 1988 28 -8 32  
AVERAGE 27 37 -10 39  
 
PRECIPITATION (IN)  
YESTERDAY T 1.47 1996 0.09 -0.09 0.00  
MONTH TO DATE 0.34 1.39 -1.05 1.48  
SINCE DEC 1 0.34 1.39 -1.05 1.48  
SINCE JAN 1 40.23 39.97 0.26 34.45  
 
SNOWFALL (IN)  
YESTERDAY T 8.8 1966 0.1 -0.1  
MONTH TO DATE 4.0 1.2 2.8  
SINCE JUL 1 4.0 1.7 2.3  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 38 28 10 26  
MONTH TO DATE 345 340 5 323  
SINCE DEC 1 345 340 5 323  
SINCE JUL 1 1139 1256 -117 1050  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1281 1178 103 1559    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 32 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 40 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 13.3  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.5  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 45 400 AM  
LOWEST 32 300 PM  
AVERAGE 39  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 46 69 2015  
MINIMUM TEMPERATURE (F) 27 3 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 14 2017......SUNRISE 721 AM EST SUNSET 448 PM EST  
DECEMBER 15 2017......SUNRISE 721 AM EST SUNSET 449 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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