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For us people not living in Arabia or South Texas the difference between 37 and 42 Celsius is indeed quite important. 37 feels pretty hot, but yet livable, while 42 (and even 40 for me) means that nothing non-urgent should bring me out of the house.

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And, inversely, the five degree drop from, say, 3C to -2C represents means water can and will freeze, which is another massive change in livability.

Indeed. At 3C in London, the humidity seeps into every pore and settles into your bones. Riding a bike at 3C, unless you're wearing a balaclava and a ski mask, is an exercise in pure pain, as the wetness sublimating off your face has approximately the same effect on your facial nerves as being flayed.

Ok the other hand, -2C in London is crisp and invigorating and entirely preferable in every possible way.

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