Why is the highest temperature in a year in summer instead of summer solstice?

Summer is one of 24 solar terms, which falls on July 23rd or 24th every year.

The summer solstice is the period when the direct point of the sun reaches the northernmost point-the Tropic of Cancer at 23.5 N, and the solar altitude angle is the largest in most parts of China. Although it is the maximum period of solar radiation, it is not the maximum period of temperature. The reason is that there are two links between solar radiation and atmospheric warming, which are influenced by many factors.

The two links are 1, and solar radiation warms the surface; 2. Ground radiation warms the atmosphere. Both links need time to reach the maximum, so the appearance of the highest temperature in the atmosphere should be delayed.

Among many factors that affect atmospheric warming, weather is the most important, with less rainfall, sunny weather and high atmospheric temperature. For example, under the control of subtropical high, the middle and lower reaches of the Yangtze River are sunny and rainy, so the temperature is high. For example, Nanjing, Wuhan, Chongqing and China are three famous cities with stoves along the Yangtze River.