We often describe the cold weather as "nine cold days". In fact, it's the coldest time of the year. It's the coldest time of the year. It's the coldest time of the year. When does it start?
The first day of September 2019
Thirty nine days refers to the third nine days from the winter solstice. It is thirty-nine days from the 19th day to the 27th day from the winter solstice. And the number of nines per year generally appears from the winter solstice to the next year's hibernation, which is also the coldest time of the year.
From January 9, 2019 to January 17, 2019.
The ninth day of September 2019
January 9, 2019 the first day of September 39;
January 10, 2019 the second day of September 39;
January 11, 2019, the third day of September 39;
January 12, 2019 the fourth day of September 39;
January 13, 2019 the fifth day of September 39;
January 14, 2019, the sixth day of September 39;
January 15, 2019, the seventh day of September 39;
January 16, 2019, the eighth day of September 39;
January 17, 2019, the ninth day of September.
Why is it cold in September
39 days
It is often said that "cold in September and hot in the third volt", but why is it said that "cold in September"? Shouldn't the coldest time be the winter solstice solar term?
From the beginning of the winter solstice, we have entered the coldest nine days of the year. Every nine days is a node, until the end of the cold winter nine days later. In this cold 81 days, it is generally acknowledged that the coldest time is the third nine days, which is what we often say that the coldest time is the third nine days. The main reason why people have such a view is that when the winter solstice sunshine time is the shortest, the heat absorbed is also the least. But at this time, the heat on the ground is still in stock. The ground temperature has not reached the lowest point, so the winter solstice is not the coldest time. But from the beginning of the winter solstice, the heat consumption on the ground is far greater than the heat absorbed. The heat consumption on the ground will be more and more. By the end of the third and ninth days, the temperature on the ground is basically the lowest. After the third and ninth days, the time of sun irradiation is gradually increasing, and the temperature on the ground is gradually rising. That's why it's cold in September.