Ahhh. Terrible Rodent Prognosticator

The text that follows was taken from an email sent to me by this day in history. It is far more than you might want to know but the Candlemas reference is intriguing and I'll read about that and get back to you.

1887 : First 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. 

Groundhog Day has its roots in the ancient Christian tradition of Candlemas Day, when clergy would bless and distribute candles needed for winter. The candles represented how long and cold the winter would be.

Germans expanded on this concept by selecting an animal--the hedgehog--as a means of predicting weather. Once they came to America, German settlers in Pennsylvania continued the tradition, although they switched from hedgehogs to groundhogs, which were plentiful in the Keystone State. 

Groundhogs, also called woodchucks and whose scientific name is Marmota monax, typically weigh 12 to 15 pounds and live six to eight years.  In February, male groundhogs emerge from their burrows to look for a mate (not to predict the weather) before going underground again. They come out of hibernation for good in March. 
In 1887, a newspaper editor belonging to a group of groundhog hunters from Punxsutawney called the Punxsutawney Groundhog Club declared that Phil, the Punxsutawney groundhog, was America's only true weather-forecasting groundhog.