‘Red sky at night, shepherd’s delight – red sky in the morning, sailor’s warning.’ So the saying goes – but why? This occurs when the weather predominantly comes from the west, as it does in Britain.
A red sky at night means high pressure is moving in from the west and the next day will be sunny. A red sky in the morning signals that high pressure has already moved east, giving way to low pressure with wet and windy weather – necessitating that shepherd’s warning… More at Country Life.
“Dad, why is the sky red?” Now you can answer…