338  
CDUS41 KLWX 100525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT MON SEP 10 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 9 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 64 419 PM 98 2016 82 -18 71  
MINIMUM 57 246 AM 40 1986 59 -2 50  
AVERAGE 61 71 -10 61  
 
PRECIPITATION (IN)  
YESTERDAY 1.40R 1.34 1999 0.13 1.27 0.00  
MONTH TO DATE 2.38 1.07 1.31 1.63  
SINCE SEP 1 2.38 1.07 1.31 1.63  
SINCE JAN 1 45.64 29.07 16.57 34.63  
 
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 4 1 3 4  
MONTH TO DATE 4 2 2 21  
SINCE SEP 1 4 2 2 21  
SINCE JUL 1 4 4 0 22  
 
COOLING  
YESTERDAY 0 6 -6 0  
MONTH TO DATE 115 65 50 19  
SINCE SEP 1 115 65 50 19  
SINCE JAN 1 1299 1081 218 1080    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 21 HIGHEST WIND DIRECTION NE (60)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION NE (50)  
AVERAGE WIND SPEED 10.5  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 AM  
LOWEST 90 900 PM  
AVERAGE 95  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 82 99 1983  
MINIMUM TEMPERATURE (F) 59 43 1981  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 10 2018.....SUNRISE 647 AM EDT SUNSET 726 PM EDT  
SEPTEMBER 11 2018.....SUNRISE 648 AM EDT SUNSET 724 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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