Why does it rain during Guyu?

Because the weather of Guyu solar term is mainly rainy, which is conducive to the growth of grains.

During the Grain Rain season in the south, "poplars are crowing after all their leaves have fallen," catkins are flying down, cuckoos are crowing at night, peonies are blooming, and cherries are red and ripe. The natural scenery tells people that it is late spring. At this time, the temperature rises rapidly. Grain Rain is the last solar term in spring. At this time, the seedlings in the fields are first planted and new crops are planted. They need the moisture of rain the most, so it is said that "spring rain is as precious as oil."

After the Grain Rain solar term, rainfall increases and the humidity in the air gradually increases. There will be multiple precipitation weather processes in the south. Among them, from April 19 to 21, there were moderate to heavy rains in Jiangnan, South China, the eastern part of the Sichuan Basin and Guizhou; there were light to moderate rains and local heavy rains in northeastern Inner Mongolia and the northern part of Northeast China.

In addition, around the 23rd, 26th and 30th, there will be precipitation in South China, Jiangnan, and North China. Generally speaking, rain is beneficial to replenishing moisture in the north, but heavy local rains in the south need to be strengthened to prevent adverse effects on spring sowing. In terms of temperature, the temperature in most parts of my country during this year's Guyu solar term was lower than the same period in normal years.

Affected by the cold air in the early stage, the temperature in the north will generally drop by 6-8℃ and 10-14℃ in some areas, which will hinder the spring sowing process. Among them, the temperature drop in the Northeast is the most severe, with the cumulative drop being mostly above 10°C. The highest temperature will drop from above 20°C to below 10°C, and the lowest temperature will also drop from close to 10°C to below freezing point, once again experiencing the winter-like coldness.

Historical origin

The twenty-four solar terms are specific seasons in the calendar that represent changes in natural rhythms. One year old and four o'clock, three months each in spring, summer, autumn and winter, each month has two solar terms, each solar term has its own unique meaning. Grain Rain is the last solar term in spring. Grain Rain is derived from the meaning of "rain produces hundreds of grains".

In traditional farming culture, the Grain Rain solar term connects "grain" and "rain", indicating precipitation conditions and "rain produces hundreds of grains." The most important characteristic of Grain Rain is that the spring rain is continuous and the rain produces hundreds of grains, which reflects the agricultural climate significance of "Grain Rain". It is the reflection of the ancient farming culture on the seasons.