358  
CDUS41 KLWX 182123  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
423 PM EST TUE DEC 18 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 18 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 45 330 PM 76 2006 45 0 57  
MINIMUM 35 417 AM 3 1989 26 9 28  
AVERAGE 40 36 4 43  
 
PRECIPITATION (IN)  
TODAY 0.00 2.92 1977 0.09 -0.09 0.00  
MONTH TO DATE 3.38 1.86 1.52 0.39  
SINCE DEC 1 3.38 1.86 1.52 0.39  
SINCE JAN 1 64.36 40.44 23.92 40.28  
 
SNOWFALL (IN)  
TODAY 0.0 2.0 2009 0.1 -0.1  
MONTH TO DATE T 1.8 -1.8  
SINCE JUL 1 3.0 2.3 0.7  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 25 29 -4 22  
MONTH TO DATE 486 484 2 497  
SINCE DEC 1 486 484 2 497  
SINCE JUL 1 1444 1400 44 1291  
 
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 22 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 30 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 13.3  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.4  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 64 400 AM  
LOWEST 40 200 PM  
AVERAGE 52  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 63 1967  
MINIMUM TEMPERATURE (F) 26 -2 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 18 2018......SUNRISE 723 AM EST SUNSET 450 PM EST  
DECEMBER 19 2018......SUNRISE 724 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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