393  
CDUS41 KLWX 210010 CCA  
CLIIAD  
 
CLIMATE REPORT...CORRECTED  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
710 PM EST THU DEC 20 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 20 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 42 1241 PM 64 1988 45 -3 53  
MINIMUM 27 509 AM 8 1991 26 1 26  
AVERAGE 35 35 0 40  
 
PRECIPITATION (IN)  
TODAY 0.04 0.66 1973 0.08 -0.04 0.00  
MONTH TO DATE 3.42 2.03 1.39 0.39  
SINCE DEC 1 3.42 2.03 1.39 0.39  
SINCE JAN 1 64.40 40.61 23.79 40.28  
 
SNOWFALL (IN)  
TODAY 0.0 4.3 1966 0.1 -0.1  
MONTH TO DATE T 2.0 -2.0  
SINCE JUL 1 3.0 2.5 0.5  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 30 30 0 25  
MONTH TO DATE 548 544 4 540  
SINCE DEC 1 548 544 4 540  
SINCE JUL 1 1506 1460 46 1334  
 
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 13 HIGHEST WIND DIRECTION NE (50)  
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION NE (40)  
AVERAGE WIND SPEED 2.5  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT RAIN  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 500 AM  
LOWEST 73 1200 PM  
AVERAGE 87  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 70 2013  
MINIMUM TEMPERATURE (F) 26 4 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 20 2018......SUNRISE 724 AM EST SUNSET 451 PM EST  
DECEMBER 21 2018......SUNRISE 725 AM EST SUNSET 451 PM EST  
 
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
   
..CORRECTED FOR SNOWFALL
 
 
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