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. Since a groundhog hibernates for the winter, its coming out of the ground is a natural sign of spring. Germans who immigrated to Pennsylvania in the mid-1800s began keeping an eye on the groundhog. Due to the groundhog population, the rodent made a handy agent for this particular weather superstition.