611  
CDUS41 KLWX 010529  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1228 AM EST TUE JAN 1 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 31 2018
 
 
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)  
YESTERDAY  
MAXIMUM 47 1159 PM 73 1992 43 4 21  
MINIMUM 30 248 AM 1 1993 24 6 10  
AVERAGE 39 34 5 16  
 
PRECIPITATION (IN)  
YESTERDAY 0.53 1.90 1975 0.07 0.46 T  
MONTH TO DATE 5.76 2.96 2.80 0.77  
SINCE DEC 1 5.76 2.96 2.80 0.77  
SINCE JAN 1 66.74 41.54 25.20 40.66  
 
SNOWFALL (IN)  
YESTERDAY 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  
YESTERDAY 26 31 -5 49  
MONTH TO DATE 804 882 -78 923  
SINCE DEC 1 804 882 -78 923  
SINCE JUL 1 1762 1798 -36 1717  
 
COOLING  
YESTERDAY 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 S (180)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 3.2  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 AM  
LOWEST 92 700 AM  
AVERAGE 96  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 68 2005  
MINIMUM TEMPERATURE (F) 24 -6 1968  
 
 
SUNRISE AND SUNSET  
JANUARY 1 2019.......SUNRISE 729 AM EST SUNSET 458 PM EST  
JANUARY 2 2019.......SUNRISE 729 AM EST SUNSET 459 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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