Groundhog day has 3 different meanings across 2 categories:
if the ground hog emerges and sees his shadow on this day, there will be 6 more weeks of winter
An annual festival held in Canada and the USA on February 2 in which the arrival time of the spring season is predicted by whether or not a certain groundhog can see its shadow.
A situation in which events appear to be repeating themselves in a cyclical fashion.