742  
CDUS41 KLWX 150534  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1230 AM EST SAT DEC 15 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 14 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 45 449 PM 69 2015 46 -1 40  
MINIMUM 28 428 AM 3 1989 27 1 26  
AVERAGE 37 37 0 33  
 
PRECIPITATION (IN)  
YESTERDAY 0.25 0.96 1999 0.10 0.15 0.00  
MONTH TO DATE 0.57 1.49 -0.92 0.37  
SINCE DEC 1 0.57 1.49 -0.92 0.37  
SINCE JAN 1 61.55 40.07 21.48 40.26  
 
SNOWFALL (IN)  
YESTERDAY 0.0 3.6 2003 0.2 -0.2  
MONTH TO DATE T 1.4 -1.4  
SINCE JUL 1 3.0 1.9 1.1  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 28 28 0 32  
MONTH TO DATE 404 368 36 377  
SINCE DEC 1 404 368 36 377  
SINCE JUL 1 1362 1284 78 1171  
 
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 10 HIGHEST WIND DIRECTION N (20)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 3.0  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
HAZE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 400 AM  
LOWEST 79 1200 AM  
AVERAGE 90  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 46 71 1971  
MINIMUM TEMPERATURE (F) 27 5 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 15 2018......SUNRISE 721 AM EST SUNSET 449 PM EST  
DECEMBER 16 2018......SUNRISE 722 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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