The origin of the rain solar term and its characteristics are as follows:

The origin of rain:

Rain is the second solar term among the 24 solar terms. Every year around February 18, when the sun's ecliptic longitude reaches 330 degrees, it is the rain solar term. At this time, the temperature began to rise, the ice and snow melted, and the precipitation increased, so it was named rainwater. It usually starts on February 18th or 19th and ends on March 4th or 5th.

Explanation of the seventy-two horoscopes of the Monthly Order: "In the middle of the first month, the sky generates water. The beginning of spring belongs to wood, but the rain that grows trees must be water, so the rain will follow after the beginning of spring. And when the east wind thaws, then "Scattered and turned into rain" means that before and after the rain solar term, everything starts to sprout, and spring is coming.

In ancient times, rainwater was divided into three periods: "In the first period, otters sacrificed fish; in the second period, swans came; and in the third period, vegetation sprouted." After this solar term, the earth flourished.

Characteristics of the rain solar term:

In the rain season, the cold and snowy weather has passed in most parts of the country, and the rainfall begins to gradually increase. In the coincidental weather of the rainy season, we walked from the sixth day of "Qijiu" to the second day of "Jiujiu".

It shows that except for most areas of the northwest, northeast, and southwest plateaus in our country, which are still in the cold winter, many other areas are in the process of or have completed the transition from winter to spring. Moistened by the spring breeze and rain, , many rural areas began to show a busy scene of spring plowing.

During the rainy season, the activity of cold air in the north is still frequent, and the weather is changeable. In early spring, the Yang Qi gradually emerges and the climate becomes warmer. People gradually wear cotton-padded clothes.

At this time, the cold in the north is not over yet, and the temperature changes greatly. Although the rainy season is not as cold as the twelfth lunar month in winter, the skin of the human body has become relatively loose, and the resistance to wind and cold is low. It will be weakened, making it susceptible to evil and causing illness. Therefore, people should also pay attention to keeping warm to a certain extent at this time.

In addition, the rainy season is one of the seasons with the most cold waves throughout the year. After bidding farewell to the flying snowflakes and bone-crushing cold, spring is coming quietly step by step, amidst the sudden warm and then cold. "There are several early orioles vying for warmth in the trees, while spring swallows peck at the new mud." During the rainy season, farmers open their windows and begin to welcome the return of swallows. In the fields, farmers began to drive cattle into the fields, and the new year's farming was in preparation.