Which month is the hottest in summer?

Generally speaking, the hottest month in most parts of the country is from July to early August, which belongs to the dog days. The hottest weather in southern China lasts from mid-June to late August, even to early September, which is often called "autumn tiger". But relatively speaking, although it is hot during the day in early autumn, it is still cooler at night than in July and August.

On the day of summer solstice, although the sun shines in the northern hemisphere for the longest time, the distance between the sun and the ground is the shortest day in a year, and the solar radiation heat obtained is the largest day in a year, the accumulated heat of the earth has not reached the maximum at this time, so the weather from summer solstice is not the hottest.

After the summer solstice, the position of the sun gradually moved south. Although the sun exposure time is shortened, the distance is getting farther and farther, and the radiant heat is gradually decreasing, the heat absorbed by the earth every day is still more than the heat lost, and the accumulated heat is getting bigger and bigger, so summer to July and August in the future is the hottest time in the northern hemisphere.

Summer climate characteristics

China has a vast territory, and the summer climate in different regions is different. Generally speaking, the southeast monsoon region in China is hot and rainy in summer, the northwest region is hot and dry in summer, and the southwest high altitude region is cool and rainy in summer.

Due to the influence of Siberian cold air, the sky in northern China is mostly cloudless in Wan Li, and the ground receives a large amount of solar radiation, with little rainfall and weak transpiration, so it is sometimes hotter in the north than in the south in summer.

Southeasterly winds prevail in China in summer, and the southeast monsoon brings moist air from the ocean. It first landed in the south of China and confronted the Siberian cold wind on the mainland, so the south of China entered the rainy season at the earliest.

With the strengthening of the southeast monsoon, rainy weather will also be ushered in July and August in northern China. As the saying goes, "May is long in South China, June is long (middle and lower reaches of the Yangtze River), and it rains in the north and south (northeast of North China)." Vivid description of rain belt movement in China.