887  
CDUS41 KLWX 122129  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
529 PM EDT WED SEP 12 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 12 2018
 
 
VALID TODAY AS OF 0500 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 81 359 PM 95 1998 81 0 77  
MINIMUM 68 807 AM 40 1967 58 10 57  
AVERAGE 75 70 5 67  
 
PRECIPITATION (IN)  
TODAY T 1.18 1965 0.13 -0.13 0.00  
MONTH TO DATE 2.72 1.45 1.27 1.63  
SINCE SEP 1 2.72 1.45 1.27 1.63  
SINCE JAN 1 45.98 29.45 16.53 34.63  
 
SNOWFALL (IN)  
TODAY 0.0 MM MM 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0  
SINCE JUL 1 0.0 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 0 1 -1 0  
MONTH TO DATE 4 5 -1 30  
SINCE SEP 1 4 5 -1 30  
SINCE JUL 1 4 7 -3 31  
 
COOLING  
TODAY 10 5 5 2  
MONTH TO DATE 129 82 47 21  
SINCE SEP 1 129 82 47 21  
SINCE JAN 1 1313 1098 215 1082    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 11 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 4.9  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 800 AM  
LOWEST 79 100 PM  
AVERAGE 90  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 81 94 1974  
MINIMUM TEMPERATURE (F) 58 43 1985  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 12 2018.....SUNRISE 648 AM EDT SUNSET 723 PM EDT  
SEPTEMBER 13 2018.....SUNRISE 649 AM EDT SUNSET 721 PM EDT  
 
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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