I voted for fall. My reasons:
1) Not too hot and not too cold (though the first only really bothers me when I'm trying to sleep, and the second I rather like -- it's just most confortable at the 50-70 degree F temperatures.
2) Unlike spring, most of the bugs are dying/hiding in the fall. I dislike bugs.
3) I like the autumn colors a lot more than the spring colors.
Fall is my favorite, then winter/summer, and spring last.
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