242  
CDUS41 KLWX 070525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST FRI DEC 7 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 6 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 43 135 PM 79 1998 49 -6 54  
MINIMUM 27 1205 AM 9 2002 29 -2 34  
AVERAGE 35 39 -4 44  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.03 2016 0.11 -0.11 0.00  
MONTH TO DATE 0.32 0.66 -0.34 0.13  
SINCE DEC 1 0.32 0.66 -0.34 0.13  
SINCE JAN 1 61.30 39.24 22.06 40.02  
 
SNOWFALL (IN)  
YESTERDAY 0.0 1.0 2003 0.1 -0.1  
MONTH TO DATE T 0.5 -0.5  
SINCE JUL 1 3.0 1.0 2.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 30 26 4 21  
MONTH TO DATE 150 150 0 129  
SINCE DEC 1 150 150 0 129  
SINCE JUL 1 1108 1066 42 923  
 
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 NW (300)  
AVERAGE WIND SPEED 6.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 78 100 AM  
LOWEST 45 100 PM  
AVERAGE 62  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 49 77 1998  
MINIMUM TEMPERATURE (F) 29 1 2002  
 
 
SUNRISE AND SUNSET  
DECEMBER 7 2018......SUNRISE 715 AM EST SUNSET 447 PM EST  
DECEMBER 8 2018......SUNRISE 716 AM EST SUNSET 447 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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