732  
CDUS41 KLWX 200537  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
137 AM EDT THU SEP 20 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 19 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 86 408 PM 93 1978 78 8 82  
1977  
MINIMUM 64 344 AM 36 1984 55 9 65  
AVERAGE 75 67 8 74  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.26 2000 0.15 -0.15 0.00  
MONTH TO DATE 3.80 2.47 1.33 1.75  
SINCE SEP 1 3.80 2.47 1.33 1.75  
SINCE JAN 1 47.06 30.47 16.59 34.75  
 
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 2 -2 0  
MONTH TO DATE 4 16 -12 30  
SINCE SEP 1 4 16 -12 30  
SINCE JUL 1 4 18 -14 31  
 
COOLING  
YESTERDAY 10 4 6 9  
MONTH TO DATE 199 113 86 71  
SINCE SEP 1 199 113 86 71  
SINCE JAN 1 1383 1129 254 1132    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 6.3  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.2  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 400 AM  
LOWEST 51 400 PM  
AVERAGE 76  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 78 91 1965  
MINIMUM TEMPERATURE (F) 55 40 1979  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 20 2018.....SUNRISE 656 AM EDT SUNSET 710 PM EDT  
SEPTEMBER 21 2018.....SUNRISE 657 AM EDT SUNSET 708 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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