159  
CDUS41 KLWX 170526  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT FRI AUG 17 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 16 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 90 405 PM 100 1997 87 3 89  
MINIMUM 67 554 AM 46 1979 65 2 65  
AVERAGE 79 76 3 77  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.45 2003 0.11 -0.11 T  
MONTH TO DATE 1.65 1.91 -0.26 2.42  
SINCE JUN 1 17.03 9.56 7.47 12.50  
SINCE JAN 1 37.68 26.38 11.30 31.59  
 
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 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 5 15 -10 6  
SINCE JUL 1 0 0 0 0  
 
COOLING  
YESTERDAY 14 11 3 12  
MONTH TO DATE 211 177 34 140  
SINCE JUN 1 819 777 42 799  
SINCE JAN 1 1011 869 142 936    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION SW (210)  
AVERAGE WIND SPEED 3.3  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 52 100 PM  
AVERAGE 76  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 87 101 1988  
MINIMUM TEMPERATURE (F) 64 44 1979  
 
 
SUNRISE AND SUNSET  
AUGUST 17 2018........SUNRISE 625 AM EDT SUNSET 802 PM EDT  
AUGUST 18 2018........SUNRISE 626 AM EDT SUNSET 801 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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