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The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
At any time there are many weather systems weaving around the globe, however when averaged over many years a global pattern of air movement emerges.
Altocumulus clouds are generally associated with settled weather and will normally appear white or grey with shading.
It’s possible to get hypothermia even when you’re indoors – if it’s very cold and temperatures drop to below 18°C (64.4F).
Please note that when changing units, only forecasts and maps will be affected.