012  
CDUS41 KLWX 312131  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
425 PM EST MON DEC 31 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 31 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 46 359 PM 73 1992 43 3 21  
MINIMUM 30 248 AM 1 1993 24 6 10  
AVERAGE 38 34 4 16  
 
PRECIPITATION (IN)  
TODAY 0.47 1.90 1975 0.07 0.40 T  
MONTH TO DATE 5.70 2.96 2.74 0.77  
SINCE DEC 1 5.70 2.96 2.74 0.77  
SINCE JAN 1 66.68 41.54 25.14 40.66  
 
SNOWFALL (IN)  
TODAY 0.0 8.5 1970 0.1 -0.1  
MONTH TO DATE T 3.5 -3.5  
SINCE JUL 1 3.0 4.0 -1.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 27 31 -4 49  
MONTH TO DATE 805 882 -77 923  
SINCE DEC 1 805 882 -77 923  
SINCE JUL 1 1763 1798 -35 1717  
 
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 8 HIGHEST WIND DIRECTION SE (130)  
HIGHEST GUST SPEED 11 HIGHEST GUST DIRECTION SE (130)  
AVERAGE WIND SPEED 1.1  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 AM  
LOWEST 92 700 AM  
AVERAGE 96  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 68 2005  
MINIMUM TEMPERATURE (F) 24 -6 1968  
 
 
SUNRISE AND SUNSET  
DECEMBER 31 2018......SUNRISE 728 AM EST SUNSET 457 PM EST  
JANUARY 1 2019.......SUNRISE 729 AM EST SUNSET 458 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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