Why is Groundhog Day observed in February?

Groundhog Day is observed in February because of latitude.

German immigrants to Punxsutawney, Pennsylvania, brought an older version of Groundhog Day to America, one in which badgers predict the weather.

The immigrants discovered that, in the United States, groundhogs are easier to find.

At the latitude of Punxsutawney, a groundhog emerges from hibernation in February.