418  
CDUS41 KLWX 252131  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
530 PM EDT TUE SEP 25 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 25 2018
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 77 323 PM 93 2010 76 1 89  
MINIMUM 64 1220 AM 33 1983 52 12 64  
AVERAGE 71 64 7 77  
 
PRECIPITATION (IN)  
TODAY 0.51 2.67 1975 0.13 0.38 0.00  
MONTH TO DATE 5.24 3.26 1.98 1.75  
SINCE SEP 1 5.24 3.26 1.98 1.75  
SINCE JAN 1 48.50 31.26 17.24 34.75  
 
SNOWFALL (IN)  
TODAY 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  
TODAY 0 3 -3 0  
MONTH TO DATE 11 33 -22 30  
SINCE SEP 1 11 33 -22 30  
SINCE JUL 1 11 35 -24 31  
 
COOLING  
TODAY 6 2 4 12  
MONTH TO DATE 225 131 94 124  
SINCE SEP 1 225 131 94 124  
SINCE JAN 1 1409 1147 262 1185    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION SW (240)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION W (250)  
AVERAGE WIND SPEED 4.6  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER MM  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT RAIN  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 700 AM  
LOWEST 87 200 PM  
AVERAGE 94  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 93 2007  
MINIMUM TEMPERATURE (F) 52 38 1983  
1964  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 25 2018.....SUNRISE 700 AM EDT SUNSET 702 PM EDT  
SEPTEMBER 26 2018.....SUNRISE 701 AM EDT SUNSET 700 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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