What's the change in the weather in summer?

This summer's weather is very characteristic: long-term rainfall in June, high temperature in July, and extreme weather phenomena appear one after another. Meteorologists pointed out that the main reason for this weather phenomenon is the abnormal position of subtropical high this year. Lu Tianjun, senior engineer of National Climate Center, "The subtropical high is a very important system in China in the second half of the year. In June, the subtropical high moved northward, causing rain belts in the middle and lower reaches of the Yangtze River. The cold air in the north is relatively strong, and the subtropical high also plays a certain role, resulting in more precipitation in the north and west of China in June. In July, the position of subtropical high was east-south The central and eastern regions of China are controlled by the warm and high pressure of the mainland, with a wide range of high temperatures, from South China to North China and from Sichuan Basin to the coast. This is relatively rare. " At the same time, experts pointed out that the abnormal subtropical high makes the rainy season in the north and south of China different from previous years. At the end of April last year and the beginning of May, Guangdong and Fujian entered the rainy season, but this time this year it was dry. The northern flood season, which should have appeared at the end of July and the beginning of August, did not arrive as scheduled, and the precipitation was concentrated in June. Meteorologists also reminded that from now on, from south to north, China is still a season of frequent meteorological disasters such as rainstorm, drought, typhoon and low temperature chilling injury. Therefore, disaster prevention and relief work can not be ignored.