Groundhog Day

On this day in 1887, Groundhog Day, featuring a rodent meteorologist, is celebrated for the first time at Gobbler’s Knob in Punxsutawney, Pennsylvania. According to tradition, if a groundhog comes out of its hole on this day and sees its shadow, there will be six more weeks of winter weather; no shadow means an early spring.

In 1993, the movie Groundhog Day starring Bill Murray popularized the usage of “groundhog day” to mean something that is repeated over and over. Today, tens of thousands of people converge on Gobbler’s Knob in Punxsutawney each February 2 to witness Phil’s prediction. The Punxsutawney Groundhog Club hosts a three-day celebration featuring entertainment and activities.
Source: http://www.history.com/this-day-in-history/first-groundhog-day