Groundhog day is some tradition that started in Pennsylvania.
If the groundhog sees his shadow, we will have 6 more weeks of winter.
This always makes me laugh because we usually have far more than 6 more weeks of winter, regardless of whether the groundhog sees its shadow or not :)
I haven't found out yet whether he saw his shadow today or not.
All I know about groundhogs is that they can be a true pest in the garden :)