Punxsutawney (whose name derives from a Native American phrase meaning “town of sandflies”) claims pre-eminence in groundhog-based divination, apparently because during the past 118 years the town has put more effort into it than anybody else.
Timothy Noah, The Groundhog Fraud
It’s always been a mystery to me why Punxsutawney should be the Groundhog capital of the world; it was just something that was taken as a given when I was growing up. This is as logical an explanation as any other I can come up with.