What has happened to the weather since the first frost?

After the first frost, the temperature difference between day and night is large, the weather is cold in the morning and evening, hot at noon, and the autumn dryness is obvious.

Frost refers to the white ice crystals that condense on the ground or objects when the radiation cooling of the ground cools the air close to the ground below the frost point. Frost refers to the phenomenon of crop freezing injury caused by sudden drop of temperature. 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.

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 it is colder in the south of China in the morning and evening. However, some parts of the north have already entered winter, and the temperature in some areas has dropped below 0 degrees Celsius. For example, the average temperature in the northeast, eastern Inner Mongolia and most parts of the northwest has been below 0 degrees Celsius.