What weather does the moon's long hair indicate?

Long hair on the moon usually indicates that it will rain soon.

As the saying goes, the moon has hair. It says there are rain clouds in the sky, and the moon seen through the clouds is fuzzy and hazy, like long hair. When the moon has long hair, it usually means that there are clouds in the sky, and the water vapor in the clouds may gradually gather into raindrops over time, thus producing rainfall.

The accuracy of this proverb is not 100%, because the hairy phenomenon on the moon does not necessarily mean that it will rain, but reflects a weather phenomenon. Because sometimes the hazy state around the moon may be caused by the scattering of particles in the atmosphere, rather than the existence of rain clouds, in practical application, it is necessary to comprehensively judge the weather trend by combining other weather phenomena and meteorological data.

A Brief Introduction to Long Hair of the Moon

Long hair on the moon, that is, halo, is an optical phenomenon in nature. It is a color aperture formed by the refraction of ice crystals when the light of the sun or the moon passes through high and thin white clouds (cirrus, cirrostratus or cirrocumulus), and the color arrangement order is in infrared violet. The aperture around the sun is called solar halo, and the aperture around the moon is called lunar halo. The moon halo appears at night.

Halo is usually ring-shaped or arc-shaped, with seven colors: red, orange, yellow, green, blue, indigo and purple. Before the weather changes, we sometimes see one or more colored or white apertures around the moon, and the sunlight and moonlight seem dim.

The above contents refer to Baidu Encyclopedia-Lunar Halo