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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.
Otherwise known as 'The King of Clouds', cumulonimbus clouds exist through the entire height of the troposphere, usually characterised by their icy, anvil-shaped top.
The classification of clouds into types was first proposed by Luke Howard in 1802 and we largely use the same system today splitting clouds into three main types - stratus, cumulus and cirrus.
Cycling in winter weather has some special challenges but that doesn't mean you need to put the bike away. British Cycling has some advice to help you cycle safely during the winter period.
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