985  
CDUS41 KLWX 092123  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
423 PM EST SUN DEC 9 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 9 2018
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 32 359 PM 72 1978 48 -16 35  
MINIMUM 29 932 AM 11 1989 29 0 25  
AVERAGE 31 38 -7 30  
 
PRECIPITATION (IN)  
TODAY 0.00 1.12 1973 0.11 -0.11 0.24  
MONTH TO DATE 0.32 0.98 -0.66 0.37  
SINCE DEC 1 0.32 0.98 -0.66 0.37  
SINCE JAN 1 61.30 39.56 21.74 40.26  
 
SNOWFALL (IN)  
TODAY 0.0 4.0 2017 0.1 -0.1  
MONTH TO DATE T 0.8 -0.8  
SINCE JUL 1 3.0 1.3 1.7  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 34 27 7 35  
MONTH TO DATE 255 230 25 218  
SINCE DEC 1 255 230 25 218  
SINCE JUL 1 1213 1146 67 1012  
 
COOLING  
TODAY 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 13 HIGHEST WIND DIRECTION N (10)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 5.1  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 69 300 AM  
LOWEST 58 100 AM  
AVERAGE 64  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 47 70 1966  
MINIMUM TEMPERATURE (F) 28 4 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 9 2018......SUNRISE 717 AM EST SUNSET 447 PM EST  
DECEMBER 10 2018......SUNRISE 718 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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