because that's when the groundhog pops out of it's hole and see it's shadow and the season change depends on it.
This is a bit of a trickey question. It is never stated, but you could count the overall amount of days shown in the film, but they don't add up in the grand scheme of things. Phil has to master...
It originated with ancient European lore which thought that badgers could predict weather.
because they sleep in the winter and wake up in the spring and its big and easy to see
Yes, Groundhog Day is important and it is very real.