384  
CDUS41 KLWX 171020 CCA  
CLIIAD  
 
CLIMATE REPORT...CORRECTED  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
520 AM EST MON DEC 17 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 16 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 49 1247 AM 72 1971 46 3 46  
MINIMUM 40 934 PM 9 2016 27 13 23  
AVERAGE 45 36 9 35  
 
PRECIPITATION (IN)  
YESTERDAY 0.32 0.99 1974 0.10 0.22 0.00  
MONTH TO DATE 3.38 1.68 1.70 0.39  
SINCE DEC 1 3.38 1.68 1.70 0.39  
SINCE JAN 1 64.36 40.26 24.10 40.28  
 
SNOWFALL (IN)  
YESTERDAY 0.0 5.2 1973 0.1 -0.1  
MONTH TO DATE T 1.6 -1.6  
SINCE JUL 1 3.0 2.1 0.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 20 29 -9 30  
MONTH TO DATE 442 426 16 447  
SINCE DEC 1 442 426 16 447  
SINCE JUL 1 1400 1342 58 1241  
 
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 20 HIGHEST WIND DIRECTION NE (40)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION NE (40)  
AVERAGE WIND SPEED 9.7  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 300 AM  
LOWEST 82 1100 PM  
AVERAGE 91  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 70 1984  
MINIMUM TEMPERATURE (F) 27 3 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 17 2018......SUNRISE 723 AM EST SUNSET 449 PM EST  
DECEMBER 18 2018......SUNRISE 723 AM EST SUNSET 450 PM EST  
 
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
   
..CORRECTED FOR SNOWFALL
 
 
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