105  
CDUS41 KLWX 090531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
130 AM EDT SUN SEP 9 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 8 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 73 1228 AM 96 2016 82 -9 76  
MINIMUM 59 1159 PM 43 1984 60 -1 48  
AVERAGE 66 71 -5 62  
 
PRECIPITATION (IN)  
YESTERDAY 0.34 3.56 1987 0.12 0.22 0.00  
MONTH TO DATE 0.98 0.94 0.04 1.63  
SINCE SEP 1 0.98 0.94 0.04 1.63  
SINCE JAN 1 44.24 28.94 15.30 34.63  
 
SNOWFALL (IN)  
YESTERDAY 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  
YESTERDAY 0 1 -1 3  
MONTH TO DATE 0 1 -1 17  
SINCE SEP 1 0 1 -1 17  
SINCE JUL 1 0 3 -3 18  
 
COOLING  
YESTERDAY 1 6 -5 0  
MONTH TO DATE 115 59 56 19  
SINCE SEP 1 115 59 56 19  
SINCE JAN 1 1299 1075 224 1080    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION N (350)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 9.1  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 81 1100 AM  
AVERAGE 91  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 82 98 2016  
MINIMUM TEMPERATURE (F) 59 40 1986  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 9 2018.....SUNRISE 646 AM EDT SUNSET 728 PM EDT  
SEPTEMBER 10 2018.....SUNRISE 647 AM EDT SUNSET 726 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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