391  
CDUS41 KLWX 202122  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
522 PM EDT THU SEP 20 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 20 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 83 222 PM 91 1965 78 5 87  
MINIMUM 64 419 AM 40 1979 55 9 61  
AVERAGE 74 66 8 74  
 
PRECIPITATION (IN)  
TODAY 0.00 0.87 1966 0.14 -0.14 0.00  
MONTH TO DATE 3.80 2.61 1.19 1.75  
SINCE SEP 1 3.80 2.61 1.19 1.75  
SINCE JAN 1 47.06 30.61 16.45 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 18 -14 30  
SINCE SEP 1 4 18 -14 30  
SINCE JUL 1 4 20 -16 31  
 
COOLING  
TODAY 9 4 5 9  
MONTH TO DATE 208 117 91 80  
SINCE SEP 1 208 117 91 80  
SINCE JAN 1 1392 1133 259 1141    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION S (200)  
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 3.7  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.5  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 200 AM  
LOWEST 65 200 PM  
AVERAGE 83  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 77 92 1998  
1965  
MINIMUM TEMPERATURE (F) 54 33 1962  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 20 2018.....SUNRISE 656 AM EDT SUNSET 710 PM EDT  
SEPTEMBER 21 2018.....SUNRISE 657 AM EDT SUNSET 708 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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