821  
CDUS41 KLWX 240524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT MON SEP 24 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 23 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 62 1159 PM 93 2010 77 -15 86  
2005  
MINIMUM 58 859 AM 33 1983 53 5 58  
AVERAGE 60 65 -5 72  
 
PRECIPITATION (IN)  
YESTERDAY 0.75 1.74 2003 0.13 0.62 0.00  
MONTH TO DATE 4.57 3.00 1.57 1.75  
SINCE SEP 1 4.57 3.00 1.57 1.75  
SINCE JAN 1 47.83 31.00 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 5 3 2 0  
MONTH TO DATE 9 27 -18 30  
SINCE SEP 1 9 27 -18 30  
SINCE JUL 1 9 29 -20 31  
 
COOLING  
YESTERDAY 0 3 -3 7  
MONTH TO DATE 219 126 93 102  
SINCE SEP 1 219 126 93 102  
SINCE JAN 1 1403 1142 261 1163    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION NE (30)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION NE (30)  
AVERAGE WIND SPEED 6.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 600 AM  
LOWEST 72 1200 AM  
AVERAGE 86  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 76 97 2010  
MINIMUM TEMPERATURE (F) 53 30 1974  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 24 2018.....SUNRISE 659 AM EDT SUNSET 704 PM EDT  
SEPTEMBER 25 2018.....SUNRISE 700 AM EDT SUNSET 702 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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