414  
CDUS41 KLWX 130521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1221 AM EST THU DEC 13 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 12 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 44 132 PM 72 1979 47 -3 46  
MINIMUM 23 744 AM 9 1988 28 -5 22  
AVERAGE 34 37 -3 34  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.95 1964 0.11 -0.11 T  
MONTH TO DATE 0.32 1.30 -0.98 0.37  
SINCE DEC 1 0.32 1.30 -0.98 0.37  
SINCE JAN 1 61.30 39.88 21.42 40.26  
 
SNOWFALL (IN)  
YESTERDAY 0.0 10.6 1982 0.1 -0.1  
MONTH TO DATE T 1.1 -1.1  
SINCE JUL 1 3.0 1.6 1.4  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 31 28 3 31  
MONTH TO DATE 352 312 40 307  
SINCE DEC 1 352 312 40 307  
SINCE JUL 1 1310 1228 82 1101  
 
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 SE (140)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION SE (140)  
AVERAGE WIND SPEED 4.0  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 81 700 AM  
LOWEST 46 600 PM  
AVERAGE 64  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 46 73 2015  
MINIMUM TEMPERATURE (F) 28 7 1988  
 
 
SUNRISE AND SUNSET  
DECEMBER 13 2018......SUNRISE 720 AM EST SUNSET 448 PM EST  
DECEMBER 14 2018......SUNRISE 721 AM EST SUNSET 448 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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