Meaning of the word "clear moon, frost soon" in English

What does "clear moon, frost soon" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

clear moon, frost soon

US /klɪr muːn, frɔːst suːn/
UK /klɪə muːn, frɒst suːn/
"clear moon, frost soon" picture

Idiom

a weather proverb suggesting that a cloudless night sky allows heat to escape, leading to frost by morning

Example:
Look at the sky tonight; clear moon, frost soon, so cover the plants.
The old farmers always said, 'Clear moon, frost soon.'