If the sun were shining, it meant that you could see your shadow. In Germany, if a badger or hedgehog had a shadow, it meant 6 more weeks of winter. If he didn’t see his shadow, it would mean an early spring. In North America, a groundhog was used in a similar way to predict the weather.
The most famous groundhog is Punxsutawney Phil. Every year, thousands of people go to Pennsylvania, the home of Punxsutawney Phil on Groundhog day, to watch whether or not he sees his shadow. In Canada, the most famous groundhog is Wiarton Willie. Willie did not see his shadow this morning, therefore predicting an early spring :)
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