The largest Groundhog Day celebration is held in Punxsutawney, Pennsylvania, where crowds as large as 40,000 gather each year.
The ceremony centres around a semi-mythical groundhog named Punxsutawney Phil.
During the ceremony, Phil emerges from his burrow in Gobblers Knob, a little woodland area near the town, where the future of the weather is decided.
A select group, called the Punxsutawney Groundhog Club Inner Circle, takes care of Phil year-round and plans the annual ceremony.
The Vice President of the Inner Circle prepares two scrolls in advance of the actual ceremony, one proclaiming six more weeks of winter and one proclaiming an early spring.