Characteristics of severe cold
1, Meteorological change characteristics: Severe cold is the coldest period in some parts of China in a year, with strong wind and low temperature, and the snow on the ground does not melt, showing a cold scene of ice and snow. At this time, the cold wave frequently goes south, which is the cold period of the year in most parts of China. The wind is strong, the temperature is low, and the snow on the ground does not melt, showing a cold scene of ice and snow. After the great cold, like the slight cold, the great cold is also a solar term indicating the cold weather. Modern meteorological observation records show that in some areas of China, severe cold is not as good as slight cold, but in some years and a few coastal areas, the annual minimum temperature will still appear in the severe cold solar terms. In the severe cold season, the average temperature in most parts of southern China is 6℃ to 8℃, which is nearly 65438 0℃ higher than slight cold. The proverb "slight cold and cold, cold into a ball" shows that the great cold solar terms are also the cold period of the year.
2, phenological phenomenon characteristics: chicken milk is waiting, chicken is a wooden beast, sensing spring in advance, and starting to hatch chickens. Second, birds with serious diseases, such as eagles, are in a state of strong predation ability, hovering in the air to find food to supplement energy to resist the cold. After three times, the water was firm and frozen, and it was extremely cold. According to the principle that extremes meet, spring water was born in the depths of hard ice, extremely frozen and about to melt.
3. Characteristics of agricultural activities: In the severe cold season, it is necessary to master the law of changes in cold and warm in agricultural production, pay close attention to the forecast of meteorological departments at any time according to different years, different geographical locations and topographic conditions, and plant crops reasonably to avoid unnecessary losses. For example, before introducing new crop varieties, we should have a clear understanding of the topography, surrounding environment, temperature, precipitation and humidity of the planting area, and fully investigate and demonstrate whether the introduced varieties are suitable for the local meteorological environment.