What are the climatic characteristics of the first frost?

Climatic characteristics of the first frost.

The first frost solar term is generally around the Gregorian calendar1October 23rd 10

What are the climatic characteristics of the first frost?

Climatic characteristics of the first frost.

The first frost solar term is generally around the Gregorian calendar1October 23rd 10 every year. At this time, the cold air goes south, the weather is getting colder and colder, and the temperature difference between day and night in the south changes greatly; However, the temperature in some parts of the north has dropped below 0℃. For example, the average temperature in the northeast, the east of Inner Mongolia and the northwest has been below 0℃, and the average temperature in the south of latitude is mostly around 16℃.

In autumn, the main climate is dry, and the temperature gradually turns cold. However, after the first frost, the temperature difference between day and night is even greater. It is very cold in the morning and evening and very hot at noon. Autumn dryness is obvious. After the first frost, the plants gradually lost their vitality and the land was desolate.

"Frost first, frost first, dew becomes frost", but from a scientific point of view, the statement of "dew becomes frost" is inaccurate. 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 water vapor content in the air on the ground should reach a certain level.

Therefore, there is not necessarily frost in first frost, and there is not necessarily frost in first frost; However, due to the low temperature during frost, if the temperature continues to drop, it will easily lead to frost.

The first Frost's agricultural song

Frost began to fall around the first frost, and some places were busy sowing wheat.

Sow wheat early and check quickly to ensure that the seedlings are all together and strong.

In this festival, people will harvest glutinous rice, and sweet potatoes will be cut, dried and stored fresh.

Pick the cotton carefully and the trees.

After harvesting in late autumn, it should be done everywhere, and firewood should be returned to the warehouse.

Take good care of the melons and vegetables in the greenhouse, topdressing and watering to prevent pests,

Green onions and radishes were harvested one after another, and Chinese cabbage also came to help.

Hurry up and mend the leaking ring of the shed, and don't let the livestock catch cold.

Tie up the livestock and raise the pigs well, and the wheat seedlings will be gnawed away.

Catch adult fish and sell them in the market, but lotus root, reed and cattail are busy harvesting.

Killing rats together in urban and rural areas not only prevents diseases but also ensures food.