904  
CDUS41 KLWX 140536  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1232 AM EST FRI DEC 14 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 13 2018
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1960 TO 2018  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 52 157 PM 73 2015 46 6 34  
MINIMUM 29 758 AM 7 1988 28 1 20  
AVERAGE 41 37 4 27  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.47 1996 0.09 -0.09 T  
MONTH TO DATE 0.32 1.39 -1.07 0.37  
SINCE DEC 1 0.32 1.39 -1.07 0.37  
SINCE JAN 1 61.30 39.97 21.33 40.26  
 
SNOWFALL (IN)  
YESTERDAY 0.0 8.8 1966 0.1 -0.1  
MONTH TO DATE T 1.2 -1.2  
SINCE JUL 1 3.0 1.7 1.3  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 24 28 -4 38  
MONTH TO DATE 376 340 36 345  
SINCE DEC 1 376 340 36 345  
SINCE JUL 1 1334 1256 78 1139  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1522 1178 344 1281    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 12 HIGHEST GUST DIRECTION S (160)  
AVERAGE WIND SPEED 2.2  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 85 800 AM  
LOWEST 44 200 PM  
AVERAGE 65  
   
......................................................
 
 
 
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 2018......SUNRISE 721 AM EST SUNSET 448 PM EST  
DECEMBER 15 2018......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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