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From a map I found[0], it looks like Sweden has an average annual temperature of around +5⁰C, and northern Ontario and Quebec are closer to -5⁰C?

Thanks. Must be the Gulf stream and general seaside climate. We have it better than we deserve.

But only 20000 years ago Sweden was covered in 3km of ice.

The Laurentide ice sheet over North America was similar depth and receded 15000 years ago. A blink in geologic time