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Do you have a citation for that? I was under the impression that was an "old wives tale". Human's often face huge temperature swings in winter.

In fact we go out of our way to experience these swings with saunas and cold plunges. I have put this up in the same category of "wet hair gives you pneumonia", but I am open to learning one way or another.

I think these T- rules haven't really been thought through at temperatures reaching and exceeding 40C.

but that's tough when the outside temp is 40°C