February 2 brings the most-watched weather forecast of the year—and the only one led by a rodent. Legend has it that on this morning, if a groundhog can see its shadow, there will be six more weeks of winter. If it cannot see its shadow, spring is on the way.
Why the Groundhog?
Since a groundhog (or woodchuck or "whistle pig") hibernates for the winter, its coming out of the ground is a natural sign of spring. In Europe centuries ago, people watched for other hibernating animals, including badgers, bears, and hedgehogs, as signs of winter's end. Germans who immigrated to Pennsylvania in the mid-1800s began keeping an eye on the groundhog. The widespread population of the rodent made it a handy agent for this particular weather superstition.
And a superstition it is. But there's a grain of truth: the winter days when you can see your shadow clearly are often especially cold, because there are no clouds overhead to insulate the earth.
Why now?
Early February is midway between the winter solstice and the spring equinox. In some places it is the start of planting season.
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