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The three months difference must be based on a wild corner case. What cities are you basing that statement on?

I played around with weatherspark and all the places I tried looked like this :

https://weatherspark.com/compare/y/1705~8813/Comparison-of-t...

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I don't know whether to call it a corner case or not, but I was pretty easily able to find this one (based on my own experience – the peak temperature in the East Bay has always felt very late in the year): https://weatherspark.com/compare/y/541~3268/Comparison-of-th...
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3 months? Wow. It should be impossible to put seasons on a shared calendar for the whole country.
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