202 1 how many days after the first frost?

Because autumn is close to winter, there will be frost in all areas at the end of autumn, especially in the north. Because of this, when frost usually comes in the morning has become a favorite topic for discussion. Let me see with you how frosty it is in general weather.

202 1 there is no uniform standard for the number of days of first frost and the number of days of first frost. After all, the temperature varies greatly in different parts of China. The first frost generally appears in late autumn, which is one of the 24 solar terms of the first frost. It's getting colder and colder, and it's frosting. At this time, the ground heat dissipation in autumn is very large, and the temperature suddenly drops below 0 degrees. Water vapor in the air directly condenses on the ground or plants to form fine ice needles, and some become hexagonal frost flowers, which are white and loose in structure.

Will it frost before the first frost? It will frost before the first frost.

Before the first frost, frost appeared in most parts of China. Frost refers to an agricultural meteorological disaster in which the temperature drops suddenly, and the temperature on the ground or near the surface of plants drops to 0℃ or below in a short time, causing crop injury and even death. Frost sometimes has frost, sometimes it doesn't, and it is a frost injury directly. Many plants will die when they are frozen. This is because plants are made up of many cells filled with water. Once the water freezes and the volume expands, it will force the water in the cells to seep out, resulting in water loss. However, it is difficult for plant cells to recover after losing water.

It depends on whether frost begins at the first frost.

Although the first frost solar term has arrived, due to the vast territory of our country, the temperature changes in different places are also different. The birthplace of the 24 solar terms is in the Yellow River Basin in ancient China. Therefore, generally speaking, by the time of the first frost in mid-September, the first frost has appeared many times in Northeast China, while the first frost will appear in the Yellow River basin. In most parts of the south, the first frost will appear later because the temperature has not dropped below zero.