On August 15, it is scientific to cover the sun with clouds and snow on the fifteenth day of the first month. It is the weather forecast experience summarized by the working people in our country in the long-term production practice, which reflects the corresponding relationship between holiday weather. That is to say, on 15 of the Mid-Autumn Festival, if the sky is overcast (cloudy or rainy) and the full moon of the Mid-Autumn Festival cannot be seen, then the fifteenth day of the first month of next year will be cloudy or snowy.

The reason is that the weather has a rhythm. Rhythm refers to the weather that will appear in the future after a certain weather appears.

This rhythm varies in length. Generally speaking, there are 30 days, 60 days, 90 days, 120 days, 150 days, 180 days and 240 days. And "Yun Zheyue August 15 Snow Lantern, June 65438+ 10/5" is calculated according to the lunar calendar, with a beat of 150 days. According to historical records, when the Mid-Autumn Festival is cloudy, cloudy or rainy, the fifteenth day of the first month of next year will be cloudy or snowy.