Here you go... I don't see anywhere where it specifically says Feb 2nd is the day groundhogs come out... I do read that they hibernate for 3 months yes, they also say they wake up early Feb... That could mean the 1st, 3rd or 4th... who knows perhaps depending on the weather it could be way earlier or later... Who knows and who cares, it just happens.
http://www.nwf.org/nationalwildlife/...articleid=1043