Fall Means More Guitar Playing?

 Yes.

 As the weather becomes less conducive to being outside, "magically" people tend to play guitar more.   There is something to be said for bands that come out of northern latitudes, who both have reasons to stay inside more as well as basements available for bands to practice in.

 At the same time, cooler temperatures also means less muscle flexibility.  I find a distinct need for more warm up time when inside temperature struggle to stay above 70 degrees; something you may not notice, until you ask your muscles to perform fine movements at speed.