I'm not aware of a cultivar hardy enough to survive outside with the winter freezes we get. People who have citrus trees up here have dwarf or semi-dwarf varieties they grow in containers that can be moved inside during the winter. I suppose if you had an extremely sheltered spot S to SW facing with no wind exposure and that could get some warmth from a house wall or something, but there's still the problem of very dry cold air to contend with. The dry cold is a lot harder on plants than wet cold.