Kat with a K

I don't get Groundhog Day.

So. The groundhog saw his shadow, six more weeks of winter, blah blah blah. But the whole thing seems pretty problematic, and yes, I realize I am completely overthinking this, but IT BOTHERS ME. Okay. Here are my questions:

1. How do you know what a groundhog sees or doesn't see in the first place?
2. Are there ever NOT six more weeks of winter? Winter doesn't end in February. That's just ridiculous.
3. For that matter, are there ever ONLY six more weeks of winter? Up here, at least, it's more like three more months of winter.
4. So maybe it's just supposed to be a local thing. But does winter ever end in February in Pennsylvania? Really?
5. Good Morning America just said something about other groundhogs in other places. So their results are local to their places? Otherwise, wouldn't they conflict sometimes?

I know this is just a ridiculous tradition, but apparently it's so ridiculous that it's bothering me.