Grain Rain means "Rain gives birth to hundreds of valleys", and the precipitation has increased obviously at this time. The seedlings in the field are newly planted, and the crops in Xinzhuang need rain most, so the so-called "spring rain is as expensive as oil". With sufficient and timely rainfall, cereal crops can thrive. Grain Rain, like rain, Xiao Man, light snow and heavy snow, is a solar term reflecting precipitation and ancient farming culture.

The main feature of the weather in Grain Rain is rainy, which is beneficial to grain growth. Grain Rain is the last solar term in spring. At this time, seedlings were planted in the field at the beginning, and new crops were planted, which needed rain most, so it was known as "Spring rain is as expensive as oil".

The ancients said, "Rain gives birth to hundreds of valleys", and the seasonal precipitation in Grain Rain is extremely important for the growth of crops. "Grain Rain" generally means an increase in rainfall, but it does not mean that it will rain in Grain Rain, but that it is more likely to rain before and after the "Grain Rain" solar term.

According to the observation of nature, the ancients in China divided Grain Rain into three stages: the first stage was when Ping began to live, the second stage was when pigeons blew their feathers, and the third stage was when mulberry fell. After Grain Rain, the rainfall increased, duckweed began to grow, then cuckoo began to remind people that it was time to sow, and then Dai Sheng bird could be seen on the mulberry tree. The flower letter from the representative of Grain Rain Sanhou is: "One peony, two peony, and three neem flowers." Three flowers are in full bloom, a hundred flowers are blooming, colorful, fragrant and full of spring.