I don't disagree that the snowfall averages are less than what you would think for this part of the country, considering that it can snow for basically a third or more of the year. That being said, we are still a good 700-800 miles from the Gulf (maybe more in my case). The east coast often gets a moisture supply from multiple bodies of water, not just the Atlantic Ocean, and they have the thermal gradient with the ocean that makes it easier to get deeper systems. We can get Atlantic moisture thrown back into the Midwest/Ohio Valley but it's not as common.