Every 2 February since the late 1880s, people have gathered in the Pennsylvanian town of Punxsutawney to watch a groundhog be pulled out of his burrow and presented to the crowd. Legend has it that if Punxsutawney Phil sees his shadow there will be six more weeks of winter; if not, spring is around the corner.

According to the US National Oceanic and Atmospheric Administration, Punxsutawney Phil's forecasts have an accuracy rate of about 35% over the past 20 years.