819  
CDUS41 KLWX 172136  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
535 PM EDT TUE OCT 17 2017  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 17 2017
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1960 TO 2017  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
TODAY  
MAXIMUM 63 326 PM 84 2016 68 -5 84  
MINIMUM 36 630 AM 31 1982 43 -7 51  
1981  
AVERAGE 50 56 -6 68  
 
PRECIPITATION (IN)  
TODAY 0.00 1.11 1975 0.10 -0.10 0.00  
MONTH TO DATE 1.48 1.78 -0.30 0.40  
SINCE SEP 1 3.23 5.70 -2.47 2.95  
SINCE JAN 1 36.23 33.70 2.53 30.95  
 
SNOWFALL (IN)  
TODAY 0.0 MM MM 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0  
SINCE JUL 1 T 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 15 10 5 0  
MONTH TO DATE 53 130 -77 93  
SINCE SEP 1 93 186 -93 99  
SINCE JUL 1 94 188 -94 99  
 
COOLING  
TODAY 0 0 0 3  
MONTH TO DATE 64 16 48 7  
SINCE SEP 1 219 157 62 262  
SINCE JAN 1 1280 1173 107 1525    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION N (350)  
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 5.2  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 500 AM  
LOWEST 30 400 PM  
AVERAGE 61  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 68 85 2016  
MINIMUM TEMPERATURE (F) 43 27 1982  
1976  
 
 
SUNRISE AND SUNSET  
OCTOBER 17 2017.......SUNRISE 722 AM EDT SUNSET 628 PM EDT  
OCTOBER 18 2017.......SUNRISE 723 AM EDT SUNSET 627 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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