It's a little late, but I had some thoughts about Groundhog Day. I know the basics. It started in Europe with Germanic tribes paying attention to when Bears and Beavers came out of hibernation.
And there were folk-sayings about "If the shadows are bright on Candlemas Day, Winter will be long" (Candlemas Day was halfway through Winter same as Groundhog Day is).
Somewhere along the line, the beavers and the shadows and Candlemas Day 1/2 through Winter got connected.
And let me note that Groundhog Day results are completely random in results. There is a 33% random chance of the groundhog being "right", and it actually is 37% (no meaningful difference).
But what really confuses me is why bother with the groundhog. People cast shadows too. So why not just step outside and see if you have a shadow YOURSELF? Do people think the groundhog will have a shadow and THEY won't? LOL!
What? It's just a fun thing to do? Oh. OK, "never mind"...