I think Boston is the more apt comparison to Europe . Yes it’s AMOC on the east coast. We’re also somewhat moderated by the coast. However further inland temperature swings are more severe because of prevailing winds crossing all that land

Either way, it’s not that Canada is further south than you’d expect but that Europe is much further north than their weather would have you believe. AMOC slowing or even stopping is going to be a problem. Someone pointed out food - if temperature trends move where food can be grown or even prevent it in some countries