Traditional Culture Encyclopedia - Weather forecast - Climatic characteristics of first frost and first frost
Climatic characteristics of first frost and first frost
2. The main climate feature in autumn is dryness, 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.
3. "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.
4. 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.
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