On Groundhogs' Day

Phil, Willie, and Chuck, a prescient rodential trio

Forecast the weather with brio

They emerge from a fog

Having slept like three logs

Growling who thought up this stunt in the frio?

Endnote: Phil resides in Punxsutawney, PA, Willie is from Woodstock, IL, and Chuck is domiciled at the Staten Island Zoo in NY. The original February holiday is the Christian feast of Candlemas. Some interesting background information comes from the Old Farmer's Almanac:

Candlemas was originally a Celtic festival celebrating the fact that the days were getting longer and spring was not far off. The Christian church expanded this festival of light to commemorate the purification of the Virgin Mary and her presentation of the infant Jesus in the Temple. Since the traditional Candlemas celebration anticipated the planting of crops, a central focus of the festivities was the forecasting of either an early spring or a lingering winter. Sunshine on Candlemas was said to indicate the return of winter. Similarly, "When the wind’s in the east on Candlemas Day / There it will stick till the second of May." A bear brought the forecast to the people of France and England, while those in Germany looked to a badger for a sign. In the 1800s, German immigrants to Pennsylvania brought their Candlemas legends with them. Finding no badgers but lots of groundhogs, or woodchucks, there, they adapted the New World species to fit the lore.