4hw.com.cn: in general, when it's raining, spring is coming to an end and summer is coming. The temperature will keep rising. The average temperature in most places will be around 20 ℃. Let's take a look at it in detail!
What's the temperature after the rain
After the solar term of grain rain, the rainfall increases, and the rain produces hundreds of grains. The rainfall is sufficient and timely, and cereal crops thrive. In the southern part of the country in the rainy season, poplars are crowing, willows are flying, cuckoos are crowing at night, peonies are spitting out their pistils, cherries are red and ripe. The natural scenery tells people that it's late spring. At this time, the temperature in the south is rising rapidly. Generally, the average temperature in late April, except for the northern and western parts of South China, has reached 20 ℃ to 22 ℃, which is more than 2 ℃ higher than that in the middle of the year.
In the eastern part of South China, a high temperature of more than 30 ℃ often appears in one or two days, which makes people feel hot. Low altitude River Valley to enter the summer. The climate characteristic of high temperature in spring in South China is conducive to the early cultivation of crops in spring. The suitable planting temperature of sweet potato is 18 ℃ to 22 ℃, which can be satisfied. The experience of the old dry area in South China has proved that sweet potato planted early after the rain can seal the rattan leaves before the summer drought, enhance the ability of drought resistance, and obtain high and stable yield.
What's the weather like
Gu Yu is the sixth solar term of the 24 solar terms and the last solar term marking spring. According to astronomy, when the sun moves on the ecliptic to reach the longitude of 30-deg, it is called Valley rain, which usually falls on April 19-21 every year. The turning point of this year's Valley rain is 17:42 on April 20. At this time of year, the crops in the field especially need rain water. There is a saying that spring rain is as expensive as oil. In ancient China, agriculture relied on the sky to eat. Only when it rained in the sky, could the crops on the ground grow. At this time, there is more and more rain, and the crops are expected to have a good harvest. Therefore, it is called "rain". Meteorological experts said that the last solar term in spring is the rain. The arrival of the rain solar term means that the cold wave weather is basically over, and the temperature recovery is accelerated, which is greatly conducive to the growth of cereal crops.
Climatic characteristics of solar terms in the valley rain
Huaihe River Basin is a transitional area between spring rain in the south of the Yangtze River and spring drought in the north. As the saying goes: 'rain is often scarce in Qingming valley', which means that there is a shortage of rain during these two solar terms. During the period of grain rain, people in Hainan Island, West Sichuan, West Guangxi, Northwest China and North China are more eager for rain. In general, there are many sunny days, strong sunshine, large evaporation, windy sand and dry air. At this time, the rain is more expensive than oil.
In the middle and lower reaches of the Yangtze River and the south of the Yangtze River, the solar term of the valley rain often begins to be obviously rainy, especially in South China. Once the cold air meets the warm and wet air, it often forms a long-term rainfall weather, which also enters the annual pre flood season. The strong convective weather wrapped in the cloud and rain will not only bring hail, thunderstorm and other disasters, but also some will be accompanied by short-term, local heavy rain or heavy rain. The 24-hour rainfall can reach 300 or 400 mm or more, causing river overflow and serious waterlogging, while the longer-term rainstorm will cause debris flow, landslide and other disasters.
According to the 24 solar terms, Gu Yu is the last solar term in spring. In late spring, Gu Yu means that spring will end and summer will come. There is less cold air invasion to the south, but the cold air activities affecting the north will not stop. From the end of April to the beginning of May, after all, the temperature is much higher than that in March, the soil is dry and loose; the air layer is unstable, and the upper level of the wind moves down, and the frontal cyclones are active. The wind and dust weather caused by them are common. The large-scale floating dust weather, the yellow sky and the falling yellow dust have eclipsed the poet's depiction of the grass growing and the birds flying, the flowers red and the willows green, and the spring.
Severe convective weather
Generally speaking, April to August is the peak of strong convective weather in a year. In May, in many areas of the south, local thunderstorms, hail, gales, tornadoes and other disastrous weather will increase significantly. Lightning, hail and wind protection are on the agenda.