That's probably because their inner thermostat is not working properly . I like the summer better than the winter, but I find such temperatures hardly bearable.
I think it's more to do with the fact that many of them are British and having a summer of any description is still a novelty for them, even it is ridiculously hot! The first August I spent there, when temperatures on the balcony of my flat hit 47 degrees was an experience. Yes, for me, it was too hot, but it was better than three months of British drizzle, cloud and misery!
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