Fall

How do some people know it's fall, some say it's because of the way the wind feels, others look at their calenders, others realize it's October, and other people go to football games.  How do I know it's fall, I, for reasons unknown can't seem to keep my hands or feet warm(cold hands don't help when you're typing).  But the most obvious thing people never think to look at to see if it's fall? The trees, just look up, for the love of all things holy, they're everywhere so if you see some yellow, it's probably fall(though it COULD be the sun in your eyes).