202  
CDUS41 KLWX 162139  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
438 PM EST SUN DEC 16 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 16 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 49 1247 AM 72 1971 46 3 46  
MINIMUM 41 359 PM 9 2016 27 14 23  
AVERAGE 45 36 9 35  
 
PRECIPITATION (IN)  
TODAY 0.32 0.99 1974 0.10 0.22 0.00  
MONTH TO DATE 3.38 1.68 1.70 0.39  
SINCE DEC 1 3.38 1.68 1.70 0.39  
SINCE JAN 1 64.36 40.26 24.10 40.28  
 
SNOWFALL (IN)  
TODAY MM 5.2 1973 0.1 MM  
MONTH TO DATE T 1.6 -1.6  
SINCE JUL 1 3.0 2.1 0.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 20 29 -9 30  
MONTH TO DATE 442 426 16 447  
SINCE DEC 1 442 426 16 447  
SINCE JUL 1 1400 1342 58 1241  
 
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 20 HIGHEST WIND DIRECTION NE (40)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION NE (40)  
AVERAGE WIND SPEED 10.6  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 300 AM  
LOWEST 92 900 AM  
AVERAGE 96  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 70 1984  
MINIMUM TEMPERATURE (F) 27 3 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 16 2018......SUNRISE 722 AM EST SUNSET 449 PM EST  
DECEMBER 17 2018......SUNRISE 723 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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