312  
CDUS41 KLWX 090530  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
128 AM EDT TUE OCT 9 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 8 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 84 258 PM 92 2007 71 13 83  
MINIMUM 66 404 AM 30 2001 46 20 73  
AVERAGE 75 59 16 78  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.79 2005 0.10 -0.10 0.09  
MONTH TO DATE T 0.84 -0.84 0.09  
SINCE SEP 1 7.36 4.76 2.60 1.84  
SINCE JAN 1 50.62 32.76 17.86 34.84  
 
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 7 -7 0  
MONTH TO DATE 0 50 -50 25  
SINCE SEP 1 13 106 -93 65  
SINCE JUL 1 13 108 -95 66  
 
COOLING  
YESTERDAY 10 1 9 13  
MONTH TO DATE 68 10 58 28  
SINCE SEP 1 309 151 158 183  
SINCE JAN 1 1493 1167 326 1244    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION S (160)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION SE (140)  
AVERAGE WIND SPEED 4.2  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.5  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 61 300 PM  
AVERAGE 81  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 70 94 2007  
MINIMUM TEMPERATURE (F) 46 26 2001  
 
 
SUNRISE AND SUNSET  
OCTOBER 9 2018.......SUNRISE 713 AM EDT SUNSET 640 PM EDT  
OCTOBER 10 2018.......SUNRISE 714 AM EDT SUNSET 639 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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