What is what does it mean when groundhog sees his shadow?

According to folklore, if a groundhog emerges from its burrow on Groundhog%20Day (February 2nd) and sees its shadow due to clear weather, it will retreat to its den and winter will persist for six more weeks. This belief is based on the idea that the animal's%20behavior is a predictor of the weather. Conversely, if the groundhog does not see its shadow, it means spring is coming early.