301  
CDUS41 KLWX 160533  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1227 AM EST SUN DEC 16 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 15 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 52 928 PM 71 1971 46 6 29  
MINIMUM 42 1232 AM 5 1989 27 15 20  
AVERAGE 47 36 11 25  
 
PRECIPITATION (IN)  
YESTERDAY 2.49R 1.07 2005 0.09 2.40 0.02  
MONTH TO DATE 3.06 1.58 1.48 0.39  
SINCE DEC 1 3.06 1.58 1.48 0.39  
SINCE JAN 1 64.04 40.16 23.88 40.28  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.7 1981 0.1 -0.1  
MONTH TO DATE T 1.5 -1.5  
SINCE JUL 1 3.0 2.0 1.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 18 29 -11 40  
MONTH TO DATE 422 397 25 417  
SINCE DEC 1 422 397 25 417  
SINCE JUL 1 1380 1313 67 1211  
 
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 16 HIGHEST WIND DIRECTION NE (40)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION NE (40)  
AVERAGE WIND SPEED 9.2  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 93 1100 PM  
AVERAGE 97  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 46 72 1971  
MINIMUM TEMPERATURE (F) 27 9 2016  
 
 
SUNRISE AND SUNSET  
DECEMBER 16 2018......SUNRISE 722 AM EST SUNSET 449 PM EST  
DECEMBER 17 2018......SUNRISE 723 AM EST SUNSET 449 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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