The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts
On the weather forecasts, they always say: “With the wind, it’ll feel like …” How is the wind-chill factor calculated? Mick Rawlinson, Brighton
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Wind chill factor was designed for a limited purpose. It measures heat loss from exposed areas of the human body, like hands and face, in low temperatures and measured wind speeds. With this information, people venturing outside in exceptionally bitter weather would know an approximate time before exposed areas of the body would succumb to frostbite. BijiDog
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