As an American Pagan, I celebrate my Imbolc holiday on February 2nd. And while most pagans make offerings to the goddess Brigid on Imbolc, I associate it with the Cailleach. Why? Because of Groundhog's Day.
This early American colonizer custom has roots in Scottish folklore. The story goes that the Cailleach, the goddess who controls the winter, leaves her home on this day to collect firewood for the rest of the season. If the weather is fair and sunny, she has time to collect a lot of wood, so the winter will last longer. If the weather is poor, she won't collect as much, so the winter will be shorter.
Eventually the story changed to being a snake coming out of its nest, because the christians commonly replaced powerful goddesses with snake imagery. When the tale was brought to the colonies, the seasons didn't quite match up with snakes emerging, so another burrowing animal was chosen, the groundhog.