682  
CDUS41 KLWX 230525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1225 AM EST SUN DEC 23 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 22 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 50 106 PM 71 2013 44 6 52  
MINIMUM 36 1134 PM 2 1989 26 10 32  
AVERAGE 43 35 8 42  
 
PRECIPITATION (IN)  
YESTERDAY 0.03 1.12 2011 0.09 -0.06 0.01  
MONTH TO DATE 4.12 2.21 1.91 0.40  
SINCE DEC 1 4.12 2.21 1.91 0.40  
SINCE JAN 1 65.10 40.79 24.31 40.29  
 
SNOWFALL (IN)  
YESTERDAY 0.0 3.3 1962 0.1 -0.1  
MONTH TO DATE T 2.2 -2.2  
SINCE JUL 1 3.0 2.7 0.3  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 22 30 -8 23  
MONTH TO DATE 572 604 -32 595  
SINCE DEC 1 572 604 -32 595  
SINCE JUL 1 1530 1520 10 1389  
 
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 30 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 38 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 14.9  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.6  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 82 100 AM  
LOWEST 56 1000 AM  
AVERAGE 69  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 68 1990  
MINIMUM TEMPERATURE (F) 25 4 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 23 2018......SUNRISE 726 AM EST SUNSET 452 PM EST  
DECEMBER 24 2018......SUNRISE 726 AM EST SUNSET 453 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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