What are the climatic characteristics of beginning of autumn? What is the impact on agriculture?

In early autumn, the daily average temperature is 29℃ to 27℃, and the rainfall is 80 mm to 100 mm, and the distribution is uneven. In this season, late rice should be cultivated and weeded, and irrigated in case of drought. Autumn sowing begins. Cotton began to pick the top. There is a saying that "big summer and little summer are not summer, but beginning of autumn is just summer". At this time, the average daily temperature in the middle and lower reaches of the Yangtze River is 25 degrees to 27 degrees; Cold and warm air began to meet again in the middle and lower reaches of the Yangtze River and entered the autumn rain period, with rainfall ranging from 80 mm to 120 mm, when late rice was in a critical period of growth.