749  
CDUS41 KLWX 112123  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
423 PM EST TUE DEC 11 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 11 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 44 246 PM 71 1979 47 -3 48  
MINIMUM 19 751 AM 3 1968 28 -9 30  
AVERAGE 32 38 -6 39  
 
PRECIPITATION (IN)  
TODAY 0.00 1.34 2008 0.10 -0.10 0.00  
MONTH TO DATE 0.32 1.19 -0.87 0.37  
SINCE DEC 1 0.32 1.19 -0.87 0.37  
SINCE JAN 1 61.30 39.77 21.53 40.26  
 
SNOWFALL (IN)  
TODAY 0.0 0.5 1962 0.1 -0.1  
MONTH TO DATE T 1.0 -1.0  
SINCE JUL 1 3.0 1.5 1.5  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 33 27 6 26  
MONTH TO DATE 321 284 37 276  
SINCE DEC 1 321 284 37 276  
SINCE JUL 1 1279 1200 79 1070  
 
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 9 HIGHEST WIND DIRECTION S (180)  
HIGHEST GUST SPEED 12 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 2.2  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.1  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 800 AM  
LOWEST 43 200 PM  
AVERAGE 72  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 72 1979  
MINIMUM TEMPERATURE (F) 28 9 1988  
 
 
SUNRISE AND SUNSET  
DECEMBER 11 2018......SUNRISE 718 AM EST SUNSET 448 PM EST  
DECEMBER 12 2018......SUNRISE 719 AM EST SUNSET 448 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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