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"The worst winter I ever spent was a summer in San Francisco" -- Mark Twain

That was the summer following a volcanic eruption, indeed, it snowed during that summer!

https://en.wikipedia.org/wiki/Year_Without_a_Summer

also: While usually attributed to him, the actual source of these words is unknown and there is no evidence that Mark Twain ever said this.

That's 73, 87, and 93 degrees for the metric impaired...

Relevants xkcds: https://xkcd.com/526/ https://xkcd.com/1643/

Well September and October are warmer than July usually.. Yes its never swimming weather but its (almost) year around t-shirt during the day light jacket at night weather. No AC or heater needed year around (heater maybe 10 nights a year)..

To be clear I listed the hottest monthly average high for each of those cities - it was July for SF, August for Athens and I don't remember for DC.