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The fame came from a time where the winters were harsh and summers more bland. We are at the tail end of a mini ice age, now the tendency is to winters been suave and summers become hotter. And, with global warming, things are accelerated.
You’d have to go back to the 19th century for those non-fossil carbon dioxide variations to matter.
https://www.newscientist.com/article/dn11645-climate-myths-we-are-simply-recovering-from-the-little-ice-age/
The notion of nice summers is way older than that, probably.