Groundhog's Day is a tradition celebrated on February 2nd where groundhogs are believed to predict the coming of spring. According to folklore, if a groundhog emerges from its burrow on this day and sees its shadow due to clear weather, it will retreat into its burrow, and winter will continue for six more weeks; if it does not see its shadow because of cloudiness, spring will come early. This tradition originated from Christian and ancient European weather prediction customs and has been celebrated in Punxsutawney, Pennsylvania since 1887.