437  
CDUS41 KLWX 182135  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
534 PM EDT TUE SEP 18 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 18 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 84 421 PM 91 1978 79 5 80  
MINIMUM 73 445 AM 37 1990 56 17 62  
AVERAGE 79 67 12 71  
 
PRECIPITATION (IN)  
TODAY 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)  
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 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  
TODAY 14 4 10 6  
MONTH TO DATE 192 109 83 62  
SINCE SEP 1 192 109 83 62  
SINCE JAN 1 1376 1125 251 1123    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED MM  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER MM  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
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 TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 78 93 1978  
1977  
MINIMUM TEMPERATURE (F) 55 36 1984  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 18 2018.....SUNRISE 654 AM EDT SUNSET 713 PM EDT  
SEPTEMBER 19 2018.....SUNRISE 655 AM EDT SUNSET 712 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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