675  
CDUS41 KLWX 172146  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
445 PM EST MON DEC 17 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 17 2018
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 56 150 PM 70 1984 45 11 51  
MINIMUM 36 544 AM 3 1989 27 9 23  
AVERAGE 46 36 10 37  
 
PRECIPITATION (IN)  
TODAY 0.00 0.75 2000 0.09 -0.09 T  
MONTH TO DATE 3.38 1.77 1.61 0.39  
SINCE DEC 1 3.38 1.77 1.61 0.39  
SINCE JAN 1 64.36 40.35 24.01 40.28  
 
SNOWFALL (IN)  
TODAY 0.0 4.3 1973 0.1 -0.1  
MONTH TO DATE T 1.7 -1.7  
SINCE JUL 1 3.0 2.2 0.8  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 19 29 -10 28  
MONTH TO DATE 461 455 6 475  
SINCE DEC 1 461 455 6 475  
SINCE JUL 1 1419 1371 48 1269  
 
COOLING  
TODAY 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 23 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 6.9  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 300 AM  
LOWEST 35 300 PM  
AVERAGE 64  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 76 2006  
MINIMUM TEMPERATURE (F) 26 3 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 17 2018......SUNRISE 723 AM EST SUNSET 449 PM EST  
DECEMBER 18 2018......SUNRISE 723 AM EST SUNSET 450 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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