Solar halos mostly appear in spring and summer. There is a folk proverb that "it rains in the middle of the night when the sun is dizzy, and it is windy at noon when the moon is dizzy", which means that if there is a solar halo, it will rain in the middle of the night, and if there is a lunar halo, it will be windy at noon the next day. To some extent, solar halo can be a precursor of weather change, and it may turn cloudy or rainy, but there is no scientific basis to say that this phenomenon can predict climate drought and flood.

Don't watch with the naked eye for a long time when the solar halo appears, so as not to burn your eyes. When it's going to rain, cirrus clouds like bird feathers often appear in the sky, and then a rainy cirrostratus appears in the air about 6 kilometers below the cirrus clouds. Due to the low temperature, the water droplets in the cloud become small ice crystals in the shape of hexagonal prisms. When the sun's light energy passes through the clouds, it is refracted on small ice crystals. It seems that there is a circle around the sun, which is red, orange, yellow, green, blue and purple from the inside out. This is a solar halo.