564  
CDUS41 KLWX 250527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1226 AM EST TUE DEC 25 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 24 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 46 218 PM 71 2015 44 2 43  
MINIMUM 35 540 AM 1 1983 25 10 35  
AVERAGE 41 34 7 39  
 
PRECIPITATION (IN)  
YESTERDAY T 2.01 1986 0.09 -0.09 0.00  
MONTH TO DATE 4.14 2.39 1.75 0.74  
SINCE DEC 1 4.14 2.39 1.75 0.74  
SINCE JAN 1 65.12 40.97 24.15 40.63  
 
SNOWFALL (IN)  
YESTERDAY 0.0 8.3 1966 0.2 -0.2  
MONTH TO DATE T 2.5 -2.5  
SINCE JUL 1 3.0 3.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 24 31 -7 26  
MONTH TO DATE 624 665 -41 635  
SINCE DEC 1 624 665 -41 635  
SINCE JUL 1 1582 1581 1 1429  
 
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 22 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 9.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 200 AM  
LOWEST 40 200 PM  
AVERAGE 66  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 71 1982  
1964  
MINIMUM TEMPERATURE (F) 25 -4 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 25 2018......SUNRISE 727 AM EST SUNSET 453 PM EST  
DECEMBER 26 2018......SUNRISE 727 AM EST SUNSET 454 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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