GroundHog Day

Groundhog Day or Groundhog's Day is a holiday celebrated in United States and Canada on February 2. In weather lore, if a groundhog, also known as a woodchuck, marmot, or ground squirrel, emerges from its burrow on this day and fails to see its shadow because the weather is cloudy, winter will soon end. If the groundhog sees its shadow, it will return into its burrow, and the winter will continue for 6 more weeks

source
Wikipedia