What is the meaning and origin of summer heat?

1, little summer, the eleventh day of the twenty-four solar terms, when the sun reaches 105 on July 7 or 8 every year, it is regarded as little summer; Summer heat, which means hot, is a little hot, not very hot. It means that the weather is getting hotter, but it is not the hottest, and most parts of the country are basically in line with it. Crops all over the country have entered a vigorous growth period, and it is necessary to strengthen field management.

2. In ancient China, the slight summer heat was divided into three periods: "First, it was warm and windy; Second, wait for crickets to live in space; The third waiting eagle began to crow. " In summer, there is no cool wind on the earth, and all the winds carry heat waves; The words describing crickets in the Book of Songs in July are "Wild July, August, September at home, October in bed." August mentioned in this paper is June in the summer calendar, which is a short time in summer. Because of the heat, crickets leave the field and go to the corner of the yard to escape the heat. In this solar term, the eagle is in the cool high air movement, because the ground temperature is too high.

3. However, according to China's surface climate data (197 1 ~ 2000), except for Qinghai, Gansu, Shanxi, Inner Mongolia and Anhui, the extreme maximum temperature in July is mostly in hot summer, and the extreme maximum temperature in most provinces is mostly in hot summer. The average temperature in July is higher than that in August in most parts of 32 provinces and cities (Taiwan Province Province). July is the hottest month of the year, and the light summer in July is actually very hot.

4, trees are shaded, from time to time. The average temperature in southern China is around 26℃ in light summer, which is already midsummer and quite hot, but it has not yet reached the hottest time. In mid-July all the year round, in the low-altitude valley area of southeastern South China, the concentration period of daily average temperature higher than 30℃ and daily maximum temperature higher than 35℃ can begin to appear, which is not conducive to heading and flowering of hybrid rice. In addition to fully considering this factor in the layout in advance, corresponding remedial measures should be taken for those that have been planted. 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.

5. Before and after the slight summer heat, the western part of South China entered the season with the most rainstorm, and the number of rainstorm days in July and August can account for more than 75% of the whole year, usually about 3 days. Mountain torrents often occur in places with large relief, and even cause mudslides. However, in the eastern part of South China, due to the frequent control of subtropical high, the weather is sunny and hot, and after experiencing a slight summer heat, it began to enter the summer drought period. The climatic characteristics of drought in the east and waterlogging in the west in most parts of southern China have a great relationship with agricultural abundance and waterlogging, so we must take measures to ensure the harvest of drought and waterlogging as soon as possible to minimize the harm.

6. Before and after the summer heat, most parts of South China entered the season with the most thunderstorms. Thunderstorm is a disastrous weather phenomenon, often accompanied by strong winds, heavy rain and sometimes hail, which is easy to cause disasters and must be prevented.