311  
CDUS41 KLWX 200523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1221 AM EST THU DEC 20 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 19 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 50 342 PM 63 1967 45 5 60  
MINIMUM 23 725 AM -2 1989 26 -3 34  
AVERAGE 37 35 2 47  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.34 2009 0.09 -0.09 0.00  
MONTH TO DATE 3.38 1.95 1.43 0.39  
SINCE DEC 1 3.38 1.95 1.43 0.39  
SINCE JAN 1 64.36 40.53 23.83 40.28  
 
SNOWFALL (IN)  
YESTERDAY 0.0 16.0 2009 0.1 -0.1  
MONTH TO DATE T 1.9 -1.9  
SINCE JUL 1 3.0 2.4 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 28 30 -2 18  
MONTH TO DATE 518 514 4 515  
SINCE DEC 1 518 514 4 515  
SINCE JUL 1 1476 1430 46 1309  
 
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 14 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 3.7  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.4  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 800 AM  
LOWEST 50 300 PM  
AVERAGE 75  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 64 1988  
MINIMUM TEMPERATURE (F) 26 8 1991  
 
 
SUNRISE AND SUNSET  
DECEMBER 20 2018......SUNRISE 724 AM EST SUNSET 451 PM EST  
DECEMBER 21 2018......SUNRISE 725 AM EST SUNSET 451 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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