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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.
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.
Now winter is well and truly here, we need to think about how we can stay as healthy as possible throughout the season.
Please note that when changing units, only forecasts and maps will be affected.