Is it hot in 2022? What is the temperature in summer? What is the origin of the intense heat?

In 2022, the heat has not yet entered. Although the weather is already very hot, it is not the hottest time yet.

In the light summer season, the sunshine time in the northern hemisphere is gradually shortened, but although the direct point of the sun is moving south, it is still direct to the northern hemisphere, so the heat in the northern hemisphere is still more than branches, and the temperature continues to rise.

After the slight summer heat, the average temperature in the southern region is around 26℃; In the low-altitude valley area in the southeast of South China, the daily average temperature is higher than 30℃, and the daily maximum temperature is higher than 35℃. In the northern part of the northwest plateau, frost and snow can still be seen at this time, which is equivalent to the scene of early spring in South China. What is the origin of the intense heat?

Summer is one of the 24 solar terms. Twenty-four solar terms are special festivals in China calendar to express the change of natural rhythm and establish December, which can accurately reflect the change of natural rhythm and contain a long cultural connotation and historical accumulation.

Twenty-four solar terms are the product of ancient farming civilization, and are the knowledge system formed by ancient ancestors following the farming season and understanding the changing laws of seasons, climate and phenology in a year by observing the movement of celestial bodies. The twenty-four solar terms were originally formulated according to the changes of stars. The Big Dipper rotates in cycles, and bucket handle rotates clockwise once, which is called one year old (Figure). The current 24 solar terms are based on the position of the sun on the ecliptic, that is, the sun's trajectory in one year is divided into 24 equal parts, each 15? Equal to 1, each equal to 1 is a solar term, which begins in the beginning of spring and ends in the great cold.

Twenty-four solar terms edited by Yuan Dynasty scholar Wu Cheng: June is hot, and the summer heat is divided into different sizes. The beginning of the month is small, the middle of the month is big, and the heat is still small today. Summer is hot. The ancients thought that the summer heat period was not the hottest time of the year, so it was called summer heat. The solar term ballad says: it's not hot in summer, but three days in summer. It is pointed out that the hottest period of the year has arrived, but it has not reached the extreme hot level.