September is the coldest time of the year.

On the 29th, there will be a second nine days before the winter solstice.

Sanjiu, the third nine days from solstice to winter.

49, there is a fourth nine days before the winter of solstice.

There is a saying in the China lunar calendar called "Jiujiu", which is used to calculate the seasons. The calculation method is from the solstice of winter (counting from the solstice of winter, which means the beginning of cold), every nine days are called a nine, the first nine days are called a nine, the second nine days are called a 29, and so on until the ninth nine days, when the number reaches 998 1 day. At this time, winter has passed and spring has arrived.

Extended data:

99 solar terms song:

1929 did not shoot; Walking on the ice in 3949; May 9, June 9, see the willows by the river; On July 9, the frozen river opened; On August 9, Yan returned; On September 9th, I added19; I plow cattle everywhere.

1, 1929 Don't make a move: 1929 After the solstice in winter, the weather is cold, and putting your hands outside will be unbearable and even cause frostbite, so you can't help but put them in your pocket, which means "Don't make a move".

2.3949: 3949 Walking on the ice is the coldest season of the year. There is thick solid ice in the river, so pedestrians can walk safely on the river.

3. Looking at willows along the river in May, 1969: At the coldest time, the weather began to get hotter in May, 1969. Rivers planted with willow branches began to sprout, and everything gradually recovered to eliminate the winter depression. People could not help but see willows.

When the snow and ice begin to melt, the frozen river will slowly thaw and the sound of water will be heard. In the warm weather in August and September, swallows will fly back from the south to nest and start a new round of busy and endless cycle.

5.99 plus 19, plowing cattle everywhere: 99 is the alarm in the 24 solar terms. The weather is getting warmer, and there is spring water gradually. The weather has been warmer. Most parts of China have entered the spring ploughing season, and cattle work is everywhere, which indicates new hope and a new beginning.