The elders say that when you see a halo around the moon, the weather is about to change.
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culture
Folk weather lore: 月晕而风,础润而雨 (yuè yùn ér fēng, chǔ rùn ér yǔ) — 'a halo round the moon means wind, damp pillar bases mean rain.' These rings (caused by ice crystals in cirrostratus clouds) really do often precede a storm front.