What are the climatic characteristics of the Millennium? What is the impact on agriculture?

In the Millennium, there is a saying that "a thousand years are divided into autumn nights, and one night is cold". With the change of monsoon, sunshine becomes shorter and weaker, and cold air begins to move south. Autumn is crisp in most parts of the country, and even the average daily temperature in southwest China has dropped below 22 degrees. At this time, the average daily temperature in the middle and lower reaches of the Yangtze River is 2 1 degree to 24 degrees, and the rainfall is 70 mm to 90 mm. Cotton is picked in batches, and the field management of autumn corn and other crops is strengthened in the later stage.