The point is that many Americans treat 'Canada' as a bucket in which everything is cold weather. And yet the whole swathe of the northern states Minnesota, North Dakota, upper Michigan, etc. are _significantly_ further north and colder than where the bulk of the Canadian population is.
I once had a coworker from Atlanta at our office in Toronto. Overheard him on the phone talking to his wife, gobsmacked by the cold, which he said "it's just so far north!" and yet that's not the reason -- we're no further north than northern California. He happened to be here during a cold front that came out of northern Ontario. It's a classic continental climate; summer heat here is as intense as that of many southern US states.
The climate on the north side of Lake Ontario is actually milder than on the other side due to lake effect and weather patterns. Just got back from a trip to the Finger Lakes; our wines in the Niagara region are noticeably riper than those from down there.