It is an exceedingly dumb law, and they can't really enforce it unless it's obvious you haven't moved because there is a foot snow on your car. Nearly every weekday I leave my favorite spot in front of my house at 7:55 AM only to return and park in that very same place about 20 minutes later. I doubt the people handing out tickets can actually tell that I've moved. I suppose that during winters like this they want to avoid letting cars sit under a bank of snow for all of February, but there are probably saner ways of accomplishing that.

I guess the take home from this is next time just clear the snow off your car so they can't prove you didn't move.