If it's a sunny day out (and it usually is on Feb. 2), he will see his shadow and so will you (see your shadow). If it's overcast, no one will have a shadow.

I read yesterday if Feb. 2 is sunny (and cold), then there is a mass of air hanging around that will mean winter isn't over. If it's cloudy, though, the air upstairs will be warmer and winter will end early.

In Germany, they had a phrase, something about being bright enough (meaning you'd see your shadow), to chase a badger back into its hole. In the new world, the badger became a tamer version, the Ground Hog.

More history here: http://www.stormfax.com/ghogday.htm