The southern circumpolar jet is no joke. https://en.wikipedia.org/wiki/Roaring_Forties
Full blown tundra climate at 46 degrees south latitude and sea level: https://en.wikipedia.org/wiki/Prince_Edward_Islands#Climate
Punta Arenas has some of the coldest summers of any similar sized city (100k or greater) in the world. Daytime average highs barely break 60. I think Reykjavik is probably the only colder city in the summer.
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