917  
CDUS41 KLWX 270522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1222 AM EST THU DEC 27 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 26 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 49 328 PM 71 1964 43 6 37  
MINIMUM 22 743 AM -1 1983 25 -3 24  
AVERAGE 36 34 2 31  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.41 2012 0.09 -0.09 0.00  
MONTH TO DATE 4.14 2.57 1.57 0.74  
SINCE DEC 1 4.14 2.57 1.57 0.74  
SINCE JAN 1 65.12 41.15 23.97 40.63  
 
SNOWFALL (IN)  
YESTERDAY 0.0 6.1 1969 0.2 -0.2  
MONTH TO DATE T 2.8 -2.8  
SINCE JUL 1 3.0 3.3 -0.3  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 29 31 -2 34  
MONTH TO DATE 685 727 -42 701  
SINCE DEC 1 685 727 -42 701  
SINCE JUL 1 1643 1643 0 1495  
 
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 10 HIGHEST WIND DIRECTION S (180)  
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 2.1  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 600 AM  
LOWEST 46 200 PM  
AVERAGE 73  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 73 1971  
MINIMUM TEMPERATURE (F) 25 1 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 27 2018......SUNRISE 727 AM EST SUNSET 455 PM EST  
DECEMBER 28 2018......SUNRISE 728 AM EST SUNSET 455 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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