The color of leaves on deciduous trees usually changes in the autumn season, and autumn is a season of transistion as the warm summer days fade giving way to cooler weather. Given these facts, during what time frame do deciduous trees' leaves change color among the following options:
- summer end
 - dry and hot
 - summer start
 - barrel-shaped
 - dry conditions
 - winter
 - after winter
 - climate


 

 summer end        