329  
CDUS41 KLWX 122129  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
428 PM EST WED DEC 12 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 12 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 44 132 PM 72 1979 47 -3 46  
MINIMUM 23 744 AM 9 1988 28 -5 22  
AVERAGE 34 37 -3 34  
 
PRECIPITATION (IN)  
TODAY 0.00 0.95 1964 0.11 -0.11 T  
MONTH TO DATE 0.32 1.30 -0.98 0.37  
SINCE DEC 1 0.32 1.30 -0.98 0.37  
SINCE JAN 1 61.30 39.88 21.42 40.26  
 
SNOWFALL (IN)  
TODAY 0.0 10.6 1982 0.1 -0.1  
MONTH TO DATE T 1.1 -1.1  
SINCE JUL 1 3.0 1.6 1.4  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 31 28 3 31  
MONTH TO DATE 352 312 40 307  
SINCE DEC 1 352 312 40 307  
SINCE JUL 1 1310 1228 82 1101  
 
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 SE (140)  
HIGHEST GUST SPEED 11 HIGHEST GUST DIRECTION SE (140)  
AVERAGE WIND SPEED 2.6  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 81 700 AM  
LOWEST 49 1200 PM  
AVERAGE 65  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 46 73 2015  
MINIMUM TEMPERATURE (F) 28 7 1988  
 
 
SUNRISE AND SUNSET  
DECEMBER 12 2018......SUNRISE 719 AM EST SUNSET 448 PM EST  
DECEMBER 13 2018......SUNRISE 720 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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