Changes of solar terms in Tomb-Sweeping Day
Qingming is a solar term that reflects the phenological changes in nature. At this time, the sun is shining, plants are sprouting, flowers are in full bloom, the air is fresh, everything is alive, and nature presents a vibrant scene. In the south of China, the climate is fresh and warm, and the land is beautiful in spring. In the northern region, the snow began to fall and gradually entered the sunny spring; At this time, the temperature in the northern region rises rapidly, precipitation is scarce, and it is dry and windy, which is the time of dusty weather in a year.
The weather here seems to be two different days in the north and south. The north is dry and rainy, and the south is wet and rainy. During the Qingming period, the rainfall in the middle and lower reaches of the Yangtze River in China increased significantly. Except for the eastern coast, the average rainfall in most areas of the south of the Yangtze River was above 100 mm in April. Due to its geographical location to the south and close to the ocean, South China began to experience heavy rainfall when it was affected by the front formed by the intersection of cold and warm air. The north is dry with little rain, and the average daily temperature in most parts of the north has risen above 12℃ except the northeast and northwest areas.
During the Qingming Festival, the temperature gets warmer, plants sprout, the weather is fine and everything is thriving. Dry farming in the north and early and middle rice in the south of the Yangtze River have entered a suitable season for mass sowing. People rolled up their sleeves and trouser legs one after another, and it was sunny to sow in the fields and sow early. North and south of the great river, inside and outside the Great Wall, there are busy scenes of spring ploughing everywhere.
However, before and after Tomb-Sweeping Day, cold air still invaded from time to time, even making the average daily temperature lower than 12℃ for more than three consecutive days, resulting in rotten seedlings of middle rice and dead seedlings of early rice. Therefore, rice planting and transplanting should avoid cold tail and warm head. In the northwest plateau, livestock are weak under the influence of severe winter and insufficient forage. At this time, it is necessary to guard against the harm of strong cooling weather to old, weak and young animals after spring.
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