What does "rain and heat at the same time" mean in geography?

The synchronization of rain and heat means the synchronization of rain and high temperature seasons. For example, the climate in China is hot and rainy in summer, so it is hot when it rains. In other words, the hot season (that is, the temperate summer) is also the rainy season. Generally speaking, the temperate continental climate and temperate maritime climate are the same, but the Mediterranean climate is not. Summer is hot and dry, and winter is mild and humid, that is, the influence of rain and heat in different periods on agriculture should be divided into two aspects, one is favorable and the other is unfavorable. Advantages: sufficient water and heat are beneficial to the growth of crops; Because precipitation is concentrated, it is easy to cause floods and reduce agricultural production. After the summer, most areas in northwest and north China have sufficient light and heat, suitable precipitation, promising autumn crops and promising harvest. Heavy rain, heavy rain and local torrential rain occurred twice in the middle and late June and late July in most parts of the south of the Yangtze River and southern China, which caused the water level of many rivers and lakes to rise sharply, causing a large-scale serious flood disaster, especially in the middle and lower reaches of the Yangtze River, causing another basin-wide flood disaster since 1954, which had a great impact on early rice filling, milk ripening and mature harvest, and reduced the production of cotton flowers, buds and peaches. The weather in Jiangnan, Jianghuai and Jianghan areas continued to be sunny, hot and rainy in early and middle July, and early rice in some areas suffered from high temperature ripening. In early and mid-August, the precipitation in most parts of the south of the Yangtze River and South China decreased significantly, and the drought in Jiangxi, Hunan, Zhejiang and Guangxi was more serious, which had a certain impact on the growth and development of crops such as late rice. Since August, precipitation in most parts of Northeast China has been higher than normal, and serious floods have occurred in Nenjiang River Basin and Songhua River Basin, and some farmland has been flooded, which has had a great impact on agricultural production on both sides of the strait. At the same time, rainy weather is not conducive to the normal growth and development of corn, rice, soybeans and other crops.