What is what does it mean if the groundhog sees its shadow?

According to tradition, if a groundhog emerges from its burrow on Groundhog%20Day (February 2nd) and sees its shadow, it will retreat back into its burrow, and winter will continue for six more weeks. This is based on the idea that clear, sunny weather on February%202nd means cold weather will persist. If the groundhog doesn't see its shadow (due to cloud cover), it suggests an early spring.