It is a proverb that one spring rain, one cold, and ten spring rains wear cotton.

As the saying goes: "an autumn rain is a cold." Rain after rain, has been as cool as autumn. In the morning, a thunderstorm knocked on the door of the golden autumn in September, and the prelude of autumn was slowly opening. At present, the weather is getting colder and colder, and people are easily tired and sleepy. When you go out, you should add clothes in time to prevent catching a cold. "The autumn wind is bleak, the weather is cold, and the vegetation shakes the frost."

As for the "need to wear cotton in the tenth autumn rain", it is only a simple statistical result of predecessors, which shows that the weather in beginning of autumn has become the need to wear cotton-padded clothes about two and a half months later, which is close to the "beginning of winter" in solar terms.

Autumn is the transition season from summer to winter, and various weather changes are very obvious after entering autumn. At this time, the direct rays of the sun gradually move southward, and the light and heat irradiated in the northern hemisphere decrease day by day, which is conducive to the accumulation of cold air in the north and its entry into China. At this time, the warm and humid airflow over the southern region is gradually decreasing, and the cold air joins it in the Jianghuai region after going south, forming rainfall. Every time the cold air goes south, it will bring an autumn rain and an autumn wind, which will cause a cooling, and the temperature will be lower every time. After several cold air southward, the temperature will be very low. Of course, "autumn rain wears cotton ten times" does not mean that you must wear cotton-padded clothes after autumn rain ten times. It just describes that after ten autumn rains, the weather is already cold, autumn is coming to an end and winter is coming, so people will wear cotton-padded clothes to keep out the cold.