Expect stormy weather when ants travel in a straight line; when they scatter all over, the weather will be fine.
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A piece of kelp or seaweed hung up will become damn previous to rain.
After a rainy winter; a plentiful summer.
When round the moon there is a brugh [halo], The weather will be cold and rough. - Scottish proverb
Cows all lying down in a field indicate coming rain.
If a black cloud eclipse the solar ray, And sudden night usurp the place of day. -Aratus [indicating rain]
Children misbehave more on a windy day.
Fogs in February mean frosts in May.