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.
Met Office weather warning for rain issued in the South West
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Met Office predicts parts of the UK where Northern Lights could be
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UK weather: Heavy snow to hit UK with Met Office issuing warning as up to 25cm could fall, UK News
Why is the sky blue? - Met Office
Met Office weather forecast for Hertfordshire on Sunday, April 17
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UFO captured on video over Leyland as Met Office rules out weather
Met Office confirms 38.7°C at Cambridge Botanic Garden is UK's highest