The weather is coldest in September.

The "three nine, four nine" of the number nine is the coldest.

Jiujiu, also called Jiujiu in winter, is a folk method to calculate the date of warm flowers in spring and cold days in China. Generally, March and April are the coldest time, which is the coldest time of the year. When you count to nine "nine days" (998 1 day), spring will be deep and warm, and everything will be full of vitality. It's time for spring ploughing.

Law No.9 is passed down from mouth to mouth among the people in our country, which has a history but lacks records. As for when it originated, there is no exact information. In traditional culture, nine is the extreme number, the "highest yang" number and the largest number. The accumulation of "Zhiyang" means that Yin Qi is decreasing day by day, and it is tired to the end, which means that the cold is getting warmer and "the spring is deep".

The custom of counting nine

Counting to nine is one of the popular customs in China. There is a folk saying that "the summer solstice is three years old and the winter solstice is nine years old." The number nine method is passed down from mouth to mouth in some places in China, which has a history and lacks records. As for when it originated, there is no exact information. The ancients followed the example of the sky, took the image of the land, set solar terms to know solar terms, and made calendars to know time changes; Qi is divided into yin and yang, everything flows, man and astronomy are interlinked, and Tao becomes nature. In China's traditional philosophy, the rise and fall of Yin and Yang symbolizes the arrival of warmth and the departure of cold.

In traditional culture, nine is the limit number, which is the largest, most and longest concept. Nine nines is eighty-one, which is the "maximum" number. Nine is the number of "the sun", also called, and nine is the largest number. "Sunrise" accumulates over time, indicating that Yin Qi is decreasing day by day, and it is exhausted for nine times, indicating that the cold is getting warmer and the "spring is deep". It's time for spring ploughing. The above contents are for reference only.