What does summer heat mean?

The summer heat is the twelfth solar term in the twenty-four solar terms of the lunar calendar. At this time, the sun reaches the longitude of the yellow meridian 120 degrees. "Tongwei Filial Piety Helps the Gods": "The fifteenth day of Xia Hou is not summer, but mid-June. The small ones and the big ones are extremely hot, and they are divided into sizes. It was small at first, and it became big after reading it. "

At this time, before and after the mid-autumn period, most parts of China are the hottest period in a year, and the growth rate of heat-loving crops is also the fastest. The working people in China divide the summer heat into three periods: "rotten grass is firefly;" Second, wait for the soil to moisten and cool off the heat; It clears up when it rains. "There are more than 2,000 kinds of fireflies in the world, which are divided into aquatic and terrestrial. Terrestrial fireflies lay eggs on hay, and when it is hot, fireflies ovulate, so the ancients thought fireflies were made of rotten grass. The second weather is that the weather becomes sultry and the land is wet. The third kind of weather is frequent thunderstorm, which weakens the heat and humidity, and the weather begins to transition to beginning of autumn.

In the western part of South China, although the high temperature appears most frequently, the rain is the most abundant and the thunderstorm is the most common, which is the season with the most thunderstorms. There is a proverb here: "If the east flash doesn't fall, the west flash can't go." It means that in the summer afternoon, if there is lightning in the east, the rain will not come here. If lightning is in the west, the rain will come soon, and it's too late to hide.

According to whether it is hot or not, there are many agricultural proverbs to predict the weather in the later period: for example, in the short term, there will be a "great summer, and the fields will rest;" It is cool in summer and the pond is full of water "; Mid-term means "great heat, cool after autumn"; Long-term predictions include "the heat is unbearable, and there will be no frost for four months", "the heat is not hot, the winter is not cold" and "the heat is not hot, and the winter will rot".