When was the first frost in 2020?
Q: When was the first frost in 2020?
A: The frost in early 2020 is the solar calendar: 65438+20201October 23rd.
Lunar date: the seventh day of September.
Introduction of the first frost.
The solar term of the first frost means that the weather is getting colder and first frost begins. In the south latitude Sichuan Basin, the average temperature is about 65438 06℃, and there are three solar terms before the first frost day. In the southern valley of the basin, frost can only be seen in the dead of winter. Of course, even at the same latitude, the temperature and humidity of the air close to the stratum are different due to the difference of altitude and topography, and the first frost period and frost day are also different.
From a scientific point of view, it is not accurate to say that dew forms frost. The frozen dew formed by dew freezing is hard small ice beads. Frost refers to the phenomenon of crop freezing injury caused by the sudden drop of temperature, and its harmful temperature varies with crops, varieties and growth periods. To form frost, the temperature of the ground or ground objects must drop below 0℃, and the moisture content in the ground air must reach a certain level.
Therefore, there may not be frost in first frost, and there may not be frost in first frost. However, due to the low temperature during frost, if the temperature continues to drop, it will easily lead to frost.
After the first frost, a large number of Dioscorea zingiberensis were collected and excavated in the basin. If the harvest is too early, the lump will not fully expand, which will affect the yield; But if the harvest is too late, it may be damaged by early frost, and the block will be frozen and deteriorated, so it is very important to dig it out in time.
Climatic characteristics of the first frost.
The first frost is the last solar term in autumn, and it is also the solar term for the transition from autumn to winter. This solar term is called the first frost, but the frost does not fall from the sky, but condenses when it meets something. When the near-surface temperature is lower than 0℃, water vapor condenses into crystal frost flowers or ice needles.
The first frost is a solar term representing the temperature change, which means that the weather turns cold, dew condenses into frost and frost begins to appear. Meteorologists said that the first frost and the first frost reflected the climate characteristics of the Yellow River basin. After the first frost solar terms, the influence of cold air going south will be more frequent, and the autumn will be stronger everywhere.
The first frost season is also the time when the seasons alternate. At this time, under the action of cold and warm air, the atmospheric inversion phenomenon is easy to occur in Huanghuai area, that is, the upper atmospheric temperature is higher than the lower atmospheric temperature. Once the inversion occurs, pollutants in the near-surface atmospheric environment will accumulate due to insufficient convection and diffusion, causing pollution, and a smog will come again.
The first frost and the first frost reflect the climate characteristics of the Yellow River basin. The first frost in autumn is called the first frost. The earlier the first frost, the greater the harm to crops. The first frost in all parts of China is gradually delayed from north to south and from mountainous areas to plains.
Except for areas with frost all the year round, frost first appeared in the north of Daxing 'anling, usually at the end of August. The first frost in most parts of Northeast China, Inner Mongolia and Northern Xinjiang is mostly in September. 10 Frost has appeared in Shenyang, Chengde, Yulin, Qamdo and Lhasa. 165438+1Frost has been seen in Shandong Peninsula, Zhengzhou, Xi 'an and northwest Yunnan in early October; 30 north latitude in eastern China? About, Yunnan Hanshui, latitude 2? Frost will not be seen in the surrounding areas until the beginning of 65438+February; When first frost went from Xiamen and Guangzhou to Baise and Simao, it was the beginning of October after 65438+ years.
What does the first frost eat?
In some parts of China, people eat red persimmons in the first frost season. Persimmon is regarded by them as the first food in first frost, which is used to keep warm, and at the same time, it can strengthen bones and muscles. The old man in Quanzhou said that the first frost eats persimmons: the first frost eats persimmons, and the nose will not flow. In some places, the explanation of this custom is that the first frost will eat shuttlecock on this day, otherwise his lips will crack all winter. At this time, people living in rural areas will climb tall persimmon trees and pick some bright and sweet persimmons to eat.