Big proponent of Winter tires on all cars that see winter. Big proponent of Max Performance Summers on all cars that are ever driven in anger and see rain.
As far as anywhere on the east coast goes, I'd feel super sketchy running summer tires in Jan/Feb anything too much north of Myrtle Beach. West coast? I'd just rock summers year round from San Diego to Vancouver BC, and worst case take the occasional Uber. North Virginia? My chest hair's just not thick enough for summer tires year round there.