081  
CDUS41 KLWX 180528  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT TUE SEP 18 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 17 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 78 501 PM 97 1991 79 -1 83  
MINIMUM 71 1227 AM 35 1986 56 15 62  
AVERAGE 75 68 7 73  
 
PRECIPITATION (IN)  
YESTERDAY 1.00 1.71 2004 0.14 0.86 0.00  
MONTH TO DATE 3.74 2.17 1.57 1.75  
SINCE SEP 1 3.74 2.17 1.57 1.75  
SINCE JAN 1 47.00 30.17 16.83 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 12 -8 30  
SINCE SEP 1 4 12 -8 30  
SINCE JUL 1 4 14 -10 31  
 
COOLING  
YESTERDAY 10 4 6 8  
MONTH TO DATE 178 105 73 56  
SINCE SEP 1 178 105 73 56  
SINCE JAN 1 1362 1121 241 1117    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION S (160)  
AVERAGE WIND SPEED 9.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 200 AM  
LOWEST 93 1200 AM  
AVERAGE 97  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 91 1978  
MINIMUM TEMPERATURE (F) 56 37 1990  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 18 2018.....SUNRISE 654 AM EDT SUNSET 713 PM EDT  
SEPTEMBER 19 2018.....SUNRISE 655 AM EDT SUNSET 712 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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