473  
CDUS41 KLWX 190524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST WED DEC 19 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 18 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 45 330 PM 76 2006 45 0 57  
MINIMUM 26 1159 PM 3 1989 26 0 28  
AVERAGE 36 36 0 43  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.92 1977 0.09 -0.09 0.00  
MONTH TO DATE 3.38 1.86 1.52 0.39  
SINCE DEC 1 3.38 1.86 1.52 0.39  
SINCE JAN 1 64.36 40.44 23.92 40.28  
 
SNOWFALL (IN)  
YESTERDAY 0.0 2.0 2009 0.1 -0.1  
MONTH TO DATE T 1.8 -1.8  
SINCE JUL 1 3.0 2.3 0.7  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 29 29 0 22  
MONTH TO DATE 490 484 6 497  
SINCE DEC 1 490 484 6 497  
SINCE JUL 1 1448 1400 48 1291  
 
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 22 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 30 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 10.7  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.3  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 81 1000 PM  
LOWEST 40 200 PM  
AVERAGE 61  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 63 1967  
MINIMUM TEMPERATURE (F) 26 -2 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 19 2018......SUNRISE 724 AM EST SUNSET 450 PM EST  
DECEMBER 20 2018......SUNRISE 724 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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