What are the climatic characteristics of Ningdu County all year round?
Four seasons change
Winter165438+1from late October to early February 65438+In winter, Ningdu is located in the southeast of the cold high in Mongolia, so the north wind or northeast wind often blows. During this period, there was a cold wave accompanied by frost, snow and freezing weather. Normal years are: the previous winter was cold, sunny, frosty and dry; It is rainy and snowy after winter, and the weather is cloudy and cold. As the saying goes, "39, 49, don't shoot when you meet." He also said: "Great cold, slight cold, dripping into a ball." 1From mid-October to mid-February, it is the coldest season in the whole year, during which heavy snow and freezing rain mostly occur.
In the middle and late March of spring, the intensity of cold high in Mongolia gradually weakened, and the Pacific subtropical high gradually approached the county. The temperature rose and the rain increased, which was called "continuous spring rain" and "no sunny day in spring". However, the early temperature is still low, often affected by strong cold air, and sometimes the weather is cold. As the saying goes, "The tiger froze to death in Qingming Grain Rain". In the later period, the north-south air mass moved towards each other in the county. The precipitation is strongly concentrated, and there are often heavy rains, which makes the river water level rise sharply and flash floods. This is the flood season in Ningdu, and there are often thunderstorms or hail.
It enters summer in late May and enters midsummer after the flood season. Controlled by the Pacific subtropical high, the weather is hot. Because it is located at the northern edge of high pressure, it often blows south wind or southwest wind. There is a saying called "Xiao Nanfeng 18 days." When the subtropical high is strengthened or weakened, it is easy to form hot thunderstorm weather. This kind of thermal thunderstorm mostly occurs in the afternoon or evening, and its locality is obvious. There is a saying that "summer rain blocks the wall, and women don't shower their mothers." During this period, typhoons often affected the county, with precipitation, cooling, strong winds and heavy rain.
Autumn came in late September, and the summer monsoon weakened, but the temperature was still high, commonly known as "autumn tiger". However, the heat is different at this time. The so-called "the millennium equinox, the night is cold and the day is hot". It is hot during the day, but it turns cold at night, and autumn is getting stronger. During this period, the ground is controlled by cold high pressure to the middle and low altitude, and the middle and high altitude is still affected by warm high pressure. It is high pressure from the ground to the sky, and it is cold and warm, and the gas layer is stable, so it is not easy to form clouds and rain, and the weather is sunny in most years. There is "Xiaoyangchun" weather in late autumn, which promotes the flowering and even fruiting of plants.