In DC, elevation and latitude are key. The area experiences several marginal events on the bookends of winter that make or break for your seasonal snowfall totals. Living north of Interstate 70 or west of Maryland Route 97 will put you in a good spot in Maryland. As others mentioned Damascus / Mt. Airy / Lisbon are always money. Going further out, Emmittsburg or Thurmont in Frederick County are always money. West of Dulles Airport in Virginia is also a good spot.