About the 24 solar terms.

Hot in summer, hot in summer, hot in summer-hot in summer means hot. The heat is not the hottest time, but the heat is the hottest season, and the heat is the day when summer is coming to an end. They are around July 7, July 23 and August 23 of the Gregorian calendar every year. "It's cool on beginning of autumn Day" obviously associates beginning of autumn with cool weather. It can be seen that beginning of autumn is the beginning of cool autumn. Because of the different latitudes and altitudes, it is practically impossible to enter autumn at the same time in beginning of autumn. According to the climatological standard that the five-day average temperature is between 10℃ and 22℃, in China, except those places with high altitude in north latitude, beginning of autumn is still in hot summer, and even in most parts of Northeast China, there is no autumn scenery with cool breeze and yellow leaves fluttering. For the Sichuan Basin located in the middle subtropical zone, the summer heat is still heavy in August all the year round. Statistics of climate data show that the basin will not enter autumn until the middle and late September. It is impossible to say when autumn begins in the plateau mountainous area where winter is all the year round or winter is long without summer, and spring and autumn are connected. After beginning of autumn, at the jointing and booting stage of late rice in Sichuan basin, cotton bolls cracked and vomited, and field management could not be relaxed at all; Mid-season rice and summer corn enter the stage of filling maturity, so it is necessary to guard against the harm of hail, strong wind and heavy rain. The eastern and western parts of the basin should continue to do a good job in drought and flood control respectively. In the basin behind beginning of autumn, although the season is still midsummer, "beginning of autumn is full of yellow in ten days" and a golden "autumn" is coming. Summer is a solar term reflecting the temperature change. "Chu" means to hide and die, and "early summer" means that the hot summer has passed. Generally speaking, the average temperature in Sichuan Basin is 65438 0.5℃ lower than that in early autumn. In late August of some years, the average daily temperature in the west of the basin may be lower than 23℃ for more than three consecutive days, which will affect the flowering of hybrid rice. However, because the summer heat in the basin is still basically controlled by the summer monsoon, the highest temperature in the west of the basin is often higher than 30℃, and the highest temperature in the east of the basin is higher than 35℃. Especially in the low-altitude areas along the Yangtze River, in the year when the summer drought lasted, the "autumn tiger" was felt. The western Sichuan Plateau has entered the summer and autumn season, with an altitude of more than 3,500 meters, showing the scene of early winter, withered grass and increasing frost and snow. It is the early stage that the rainfall distribution in Sichuan basin changes from more in the west to less in the east. At this time, the rainfall in the central part of the basin is often the second highest in a year, which is more than that in hot summer or white dew. Therefore, in order to ensure farmland water use in winter and spring, we must do a good job of water storage in this period. There will be continuous rainy weather in the plateau from summer to autumnal equinox, which is not good for agriculture and animal husbandry production. Sichuan basin is also a busy period for harvesting mid-season rice. Generally, during the summer solar term, the sunshine in the basin is still sufficient, except for the western part of the basin, there are not many rainy days, which is beneficial to the middle rice cutting and cotton bolling. But in a few years, as Du Fu said in his poem, "The dog days have passed and the sun has turned into rain", the autumn rain will come early. Therefore, we should pay special attention to the weather forecast, make full preparations, seize every sunny day, and seize the opportunity to do a good job of grabbing the harvest and the sun.