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Because during summer at the time you go to sleep, it hasn't dropped to 15C yet. So it is actually hotter than that.
Likewise, unless you are outside at the exact time it hits the 15C maximum in winter, it will actually be cooler than that.
It's the range that's important.
Try going for a dip in a pool in Mt Isa. It might be a 30C day, but if it drops to 5C each night, the water will still be bloody freezing.
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