Meaning of the word "not cast a clout until May be out" in English

What does "not cast a clout until May be out" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

not cast a clout until May be out

US /nɑːt kæst ə klaʊt ʌnˈtɪl meɪ bi aʊt/
UK /nɒt kɑːst ə klaʊt ʌnˈtɪl meɪ bi aʊt/
"not cast a clout until May be out" picture

Idiom

a traditional proverb advising not to leave off wearing warm winter clothes until the end of May, or until the hawthorn (may) is in blossom

Example:
It's sunny today, but remember: not cast a clout until May be out.
My grandmother always said, 'not cast a clout until May be out,' to warn us about the unpredictable spring weather.