When is the frost date in 2020?

Frost's Descent is the last solar term of autumn. Frost's Descent does not mean that there will be frost, but that the temperature is about to drop sharply. Frost will appear in many areas in the morning. During this period, the temperature difference between day and night changes greatly. So in 2020 When is the annual frost date?

Question: When will the frost fall in 2020?

Answer: The frost in 2020 is on the Gregorian calendar: October 23, 2020.

Lunar calendar date: the seventh day of September (small).

Introduction to Frost's Descent

The term "Frost's Descent" means that the weather is getting colder and frost is beginning to fall. In the Sichuan Basin with a southern latitude, the average temperature is around 16°C, and there are still three solar terms before the first frost date. In the river valleys in the southern part of the basin, frost can only be seen in the middle of winter. Of course, even in places with the same latitude, due to differences in altitude and terrain, the temperature and humidity of the air close to the ground are different, so the first frost period and the number of frost days are also different.

From a scientific perspective, it is inaccurate to say that dew turns into frost. Frozen dew is formed by freezing dew drops into small, hard ice beads. Frost refers to the freezing damage to crops caused by a sharp drop in temperature. The damage temperature varies depending on the crop, variety, and growth period. To form frost, the temperature of the ground or surface must drop below 0°C, and The water vapor content in the air in the underlying formation must reach a certain level.

Therefore, when frost occurs, frost does not necessarily occur, and when frost occurs, frost does not necessarily occur. However, because the temperature is already relatively low when frost occurs, if it continues to cool, it will easily lead to frost.

After the frost, the basin began to harvest red sweet potatoes in large quantities. If you dig too early, the sweet potato cubes will not be fully enlarged, which will affect the yield; if you dig too late, you may suffer early frost damage, and the sweet potato cubes will deteriorate due to freezing and cannot withstand storage, so it is important to dig the sweet potato at the right time.

Climate Characteristics of Frost's Descent

Frost's Descent is the last solar term in autumn and the transition from autumn to winter. This solar term is called Frost's Descent, but frost does not fall from the sky, but condenses when it encounters objects. When the temperature near the ground is lower than 0℃, water vapor condenses into crystal frost flowers or ice needles.

Frost is a solar term that represents changes in temperature. It means that the weather turns cold, dew condenses into frost, and frost begins to appear. According to meteorological experts, the onset of frost reflects the climate characteristics of the Yellow River Basin. After the frost period, the impact of cold air moving southward will be more frequent, and autumn will become stronger in various places.

The frost season is also the time when the seasons change. At this time, under the influence of cold and warm air, the Huanghuai region is prone to atmospheric temperature inversion, that is, the temperature of the upper atmosphere is higher than that of the lower atmosphere. Once a temperature inversion occurs, pollutants in the near-surface atmospheric environment will accumulate due to lack of convection and diffusion, causing pollution, and a haze will come again.

Frost and 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 damage to crops. The first frost in various parts of our country is gradually delayed from north to south, from mountains to plains.

Except for areas with frost all year round, the earliest frost is in the northern part of the Daxinganling Mountains, usually at the end of August; the first frost is mostly in September in most of the Northeast, Inner Mongolia and northern Xinjiang; and the frost is in early October. It has appeared in the line from Shenyang, Chengde, Yulin, Qamdo to Lhasa; in early November, frost can already be seen from the Shandong Peninsula, Zhengzhou, Xi'an to northwest Yunnan; in eastern my country, areas around 30° north latitude, Hanshui River, and Yunnan Province at around 2° north latitude will have to reach 12 Frost begins to appear at the beginning of the month, and it is already early January after the New Year when the area from Xiamen and Guangzhou to Baise and Simao sees frost.

What to eat during frost

In some places in China, red persimmons are eaten during the frost season. Persimmons are regarded by them as a frost food that can keep out the cold and keep warm, and can also strengthen bones and muscles. An old man in Quanzhou has a saying about eating persimmons during the frost: If you eat ding persimmons during the frost, you will not have a runny nose. The explanation for this custom in some places is that you have to eat mugwort on the day of frost, otherwise your lips will be cracked throughout the winter. At this time, people living in rural areas will climb tall persimmon trees and pick a few bright and sweet persimmons to eat.