255  
CDUS41 KLWX 170531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
131 AM EDT MON SEP 17 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 16 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 80 447 PM 97 1991 79 1 84  
MINIMUM 67 714 AM 37 1984 56 11 59  
AVERAGE 74 68 6 72  
 
PRECIPITATION (IN)  
YESTERDAY T 2.05 1999 0.15 -0.15 0.00  
MONTH TO DATE 2.74 2.03 0.71 1.75  
SINCE SEP 1 2.74 2.03 0.71 1.75  
SINCE JAN 1 46.00 30.03 15.97 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 10 -6 30  
SINCE SEP 1 4 10 -6 30  
SINCE JUL 1 4 12 -8 31  
 
COOLING  
YESTERDAY 9 4 5 7  
MONTH TO DATE 168 101 67 48  
SINCE SEP 1 168 101 67 48  
SINCE JAN 1 1352 1117 235 1109    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION E (70)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION NE (60)  
AVERAGE WIND SPEED 7.3  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
HAZE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 69 400 PM  
AVERAGE 85  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 79 97 1991  
MINIMUM TEMPERATURE (F) 56 35 1986  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 17 2018.....SUNRISE 653 AM EDT SUNSET 715 PM EDT  
SEPTEMBER 18 2018.....SUNRISE 654 AM EDT SUNSET 713 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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