Minus 21C doesn’t always look very cold. In photos, at least. But believe me, it is! We discovered this on what turned out to be Beijing’s coldest day in three decades. With wind chill, it was probably closer to -25C, maybe lower still, but -21C was certainly cold enough.
At that temperature, there’s no margin for error. Dressed well, and moving, you can keep your body temperature quite comfortable. But stop, or expose your hands for more than a minute, and you lose sensation in your fingers frighteningly fast. Sitting or even just standing around, you soon feel the warmth depleting. So if you fall and hurt your leg, say, you’re going to have bigger problems than that, really fast. Devices fail in that cold, too, as batteries and LCD screens die. Lucky we knew the way, because the GPS was cactus after less than an hour.
All in all, below about minus 15, I think it’s better to stay home and drink coffee!
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