Just how accurate is Punxsutawney Phil in predicting the weather? @JohnsHopkins has a math professor willing to chat the shadowy stats of #GroundhogDay.

For more than a century, the Punxsutawney Phil has emerged each year to declare a long winter or an early spring, but how good is his track record of accurate predictions? 

Daniel Naiman, a professor in the Johns Hopkins University Department of Applied Math and Statistics, is available to discuss the shadowy math of Groundhog Day.