491  
CDUS41 KLWX 180524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT THU OCT 18 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 17 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 68 119 PM 84 2016 68 0 63  
MINIMUM 47 631 AM 31 1982 43 4 36  
1981  
AVERAGE 58 56 2 50  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.11 1975 0.10 -0.10 0.00  
MONTH TO DATE 1.21 1.78 -0.57 1.48  
SINCE SEP 1 8.57 5.70 2.87 3.23  
SINCE JAN 1 51.83 33.70 18.13 36.23  
 
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 7 10 -3 15  
MONTH TO DATE 56 130 -74 53  
SINCE SEP 1 69 186 -117 93  
SINCE JUL 1 69 188 -119 94  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 97 16 81 64  
SINCE SEP 1 338 157 181 219  
SINCE JAN 1 1522 1173 349 1280    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 26 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 7.4  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.6  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 400 AM  
LOWEST 34 100 PM  
AVERAGE 67  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 68 85 2016  
MINIMUM TEMPERATURE (F) 43 27 1982  
1976  
 
 
SUNRISE AND SUNSET  
OCTOBER 18 2018.......SUNRISE 722 AM EDT SUNSET 627 PM EDT  
OCTOBER 19 2018.......SUNRISE 723 AM EDT SUNSET 626 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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