Where I'm it goes down to about -5C in wintertime (-4C ATM). I'm actually fine with it.

Certainly in rural areas and in wider peripheral suburban areas public transport is less useful. But in actual cities (London, Paris, Istanbul, etc.) with a high density of people and their residences, public transport is the way to go. I don't know much about American cities, but if we got a comprehensive and functional system of metros, buses and boats here in Istanbul, where some of you would classify as a part of the third world, I guess you are capable of doing it in the US too.