Groundhog Day is a traditional North American holiday observed on February 2nd each year. The tradition goes like this: If Phil sees his shadow when he emerges from his burrow, it is believed that there will be six more weeks of winter. If he doesn't see his shadow, it is thought that spring will come early. This weather prediction is based on folklore and has no scientific basis, but it has become a lighthearted and widely followed tradition in the United States and Canada.