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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.
Noctilucent clouds are extremely rare very high clouds seen in the night sky, usually on clear, summer nights. They become visible about the same time as the brightest stars and are usually bluish or silvery.
Nimbostratus clouds are dark, grey, featureless layers of clouds, thick enough to block out the sun and produce persistent rain.
During the winter months, extreme weather conditions can make driving more difficult and potentially hazardous.
Please note that when changing units, only forecasts and maps will be affected.