Winter tires. Period.

Too many people think that their all-season tires can do everything. They can do everything, but they don't have the dry grip that summer tires do in warm weather, and they don't have the aggressive siping, channels and the tread compound for ice and very cold air temperatures of winter tires. All season tires do everything far worse than their specialty counterparts do, and it demonstrates itself the most every winter.

I drive lightweight RWD sports cars all year round, and we get plenty of snow in Boston. Never have had an issue with winter tires, and sometimes I deliberately seek out empty unplowed parking lots just to have extra fun in.