710  
CDUS41 KLWX 180523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT SAT AUG 18 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 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 92 216 PM 101 1988 87 5 89  
MINIMUM 71 1159 PM 44 1979 64 7 68  
AVERAGE 82 76 6 79  
 
PRECIPITATION (IN)  
YESTERDAY 0.06 3.32 1997 0.12 -0.06 T  
MONTH TO DATE 1.71 2.03 -0.32 2.42  
SINCE JUN 1 17.09 9.68 7.41 12.50  
SINCE JAN 1 37.74 26.50 11.24 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 17 11 6 14  
MONTH TO DATE 228 188 40 154  
SINCE JUN 1 836 788 48 813  
SINCE JAN 1 1028 880 148 950    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 21 HIGHEST WIND DIRECTION W (280)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 5.4  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 52 200 PM  
AVERAGE 76  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 87 98 2009  
MINIMUM TEMPERATURE (F) 64 45 1981  
 
 
SUNRISE AND SUNSET  
AUGUST 18 2018........SUNRISE 626 AM EDT SUNSET 801 PM EDT  
AUGUST 19 2018........SUNRISE 627 AM EDT SUNSET 759 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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