Groundhog day

I've always been confused about the whole groundhog seeing his shadow thing. Do we want him to see it or not?
The boys are talking about it at school so I asked if we wanted him to see his shadow. 
Peyton said: "If he sees his shadow that means 6 more weeks of Christmas!"
Hmmm
After school several days later I asked again.
Jackson said: "If he sees his shadow that means six more days of snow!"
Glad they helped me clear that up.