767  
CDUS41 KLWX 110531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1231 AM EST TUE DEC 11 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 10 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 39 241 PM 70 1966 47 -8 40  
MINIMUM 24 1157 PM 4 1989 28 -4 25  
AVERAGE 32 38 -6 33  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.26 1992 0.11 -0.11 0.00  
MONTH TO DATE 0.32 1.09 -0.77 0.37  
SINCE DEC 1 0.32 1.09 -0.77 0.37  
SINCE JAN 1 61.30 39.67 21.63 40.26  
 
SNOWFALL (IN)  
YESTERDAY 0.0 2.6 1992 0.1 -0.1  
MONTH TO DATE T 0.9 -0.9  
SINCE JUL 1 3.0 1.4 1.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 33 27 6 32  
MONTH TO DATE 288 257 31 250  
SINCE DEC 1 288 257 31 250  
SINCE JUL 1 1246 1173 73 1044  
 
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 N (350)  
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (360)  
AVERAGE WIND SPEED 8.2  
 
 
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 88 1100 PM  
LOWEST 52 300 PM  
AVERAGE 70  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 71 1979  
MINIMUM TEMPERATURE (F) 28 3 1968  
 
 
SUNRISE AND SUNSET  
DECEMBER 11 2018......SUNRISE 718 AM EST SUNSET 448 PM EST  
DECEMBER 12 2018......SUNRISE 719 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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