066  
CDUS41 KLWX 090525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST SUN DEC 9 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 8 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 36 310 PM 76 1980 48 -12 39  
MINIMUM 18 720 AM 13 2002 29 -11 33  
AVERAGE 27 38 -11 36  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.24 1972 0.10 -0.10 0.00  
MONTH TO DATE 0.32 0.87 -0.55 0.13  
SINCE DEC 1 0.32 0.87 -0.55 0.13  
SINCE JAN 1 61.30 39.45 21.85 40.02  
 
SNOWFALL (IN)  
YESTERDAY 0.0 5.0 1989 0.1 -0.1  
MONTH TO DATE T 0.7 -0.7  
SINCE JUL 1 3.0 1.2 1.8  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 38 27 11 29  
MONTH TO DATE 221 203 18 183  
SINCE DEC 1 221 203 18 183  
SINCE JUL 1 1179 1119 60 977  
 
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 17 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 5.4  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.6  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 91 400 AM  
LOWEST 44 300 PM  
AVERAGE 68  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 48 72 1978  
MINIMUM TEMPERATURE (F) 29 11 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 9 2018......SUNRISE 717 AM EST SUNSET 447 PM EST  
DECEMBER 10 2018......SUNRISE 718 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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