132  
CDUS41 KLWX 190537  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
136 AM EDT WED SEP 19 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 18 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 84 421 PM 91 1978 79 5 80  
MINIMUM 68 1159 PM 37 1990 56 12 62  
AVERAGE 76 67 9 71  
 
PRECIPITATION (IN)  
YESTERDAY 0.06 1.76 2003 0.15 -0.09 0.00  
MONTH TO DATE 3.80 2.32 1.48 1.75  
SINCE SEP 1 3.80 2.32 1.48 1.75  
SINCE JAN 1 47.06 30.32 16.74 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 14 -10 30  
SINCE SEP 1 4 14 -10 30  
SINCE JUL 1 4 16 -12 31  
 
COOLING  
YESTERDAY 11 4 7 6  
MONTH TO DATE 189 109 80 62  
SINCE SEP 1 189 109 80 62  
SINCE JAN 1 1373 1125 248 1123    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 7.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 58 400 PM  
AVERAGE 79  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 78 93 1978  
1977  
MINIMUM TEMPERATURE (F) 55 36 1984  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 19 2018.....SUNRISE 655 AM EDT SUNSET 712 PM EDT  
SEPTEMBER 20 2018.....SUNRISE 656 AM EDT SUNSET 710 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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