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> Your reaction to heat is highly dependent on acclimation.

And the other way around.

I once went to a conference, held in early spring, at a Greek hotel. It was 15 C and the hotel staff had closed the pool as it was "too cold" to swim.

Us Brits were puzzled. The Finns were utterly baffled.



If the pool is heated, swimming in 15C weather would be fine. If not, I wouldn’t swim in 15C water without spending time in a sauna or hot tub before jumping in; surfers wear wetsuits when the water is that temperature.


Here in Scotland, the first sunny day in spring over 10C and you start seeing people in t-shirts, shorts and flip-flops...


Michigan, anywhere 0C and above is shorts and a t-shirt weather after a long winter!




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