What are the climatic characteristics of summer solstice? What is the impact on agriculture?

From summer solstice, the sun shines directly on the Tropic of Cancer, and the daytime in the northern hemisphere is the longest all year round. The temperature difference between north and south of China is very small, but it is 10 degrees. In most years, the rainfall is above 100 mm, and the average daily temperature is 24 to 28 degrees. In this season, the ancestors paid attention to strengthening field management in summer, eliminating weeds in time and preventing diseases and pests.