Is there a saying that the first frost is suddenly cold and warm?

The first frost solar term reflects the climatic characteristics of sudden drop in temperature, great change in temperature difference between day and night, and obvious dryness in autumn.

During the first frost, the temperature showed a downward trend. Due to the weakening of solar radiation, the surface heat dissipates rapidly and the temperature drops gradually. It is warm in sunny days, but the temperature drops suddenly at night, and frost often appears.

After the first frost solar term, the scene of late autumn is obvious, and the cold air goes south more and more frequently. The gradual increase of daily temperature difference is one of the typical characteristics of the first frost, which is mainly caused by the decrease of sunshine time and solar irradiation angle. Therefore, during the first frost, people can observe the phenomenon that the weather is cold in the morning and evening and hot at noon.

At the same time, the first frost is also one of the main reasons for the cold weather. Under the action of radiation cooling and downward flow, cold air makes the atmospheric temperature drop sharply, leading to a significant drop in temperature.

Generally speaking, the main reasons for the cold weather in the first frost are the weakening of solar radiation, the rapid loss of surface heat and the frequent southward movement of cold air. Therefore, during the first frost, people need to take warm measures, pay attention to the change of temperature difference between morning and evening, and prevent colds and other health problems.

Brief introduction of first frost

The first frost is one of the twenty-four solar terms and the last solar term in autumn. Every year Gregorian calendar 10 is celebrated on1October 23rd or 24th, which means the weather begins to enter winter. The first frost solar terms are characterized by cold weather in the morning and evening, hot weather at noon, large temperature difference between day and night, and obvious autumn dryness. Because "first frost" is a manifestation of cold weather and large temperature difference between day and night, the solar term is named after the first frost, which means "the temperature drops suddenly and the temperature difference between day and night is large". After the first frost, the plants gradually lost their vitality and the land was desolate.

The first frost is one of the traditional 24 solar terms in China, and it is also a transitional period in autumn and winter. During their stay in the first frost, the temperature gradually dropped and the weather became colder and colder. People need to take warm measures, pay attention to the change of temperature difference between morning and evening, and prevent colds and other health problems.

The first frost not only has important agricultural significance, but also has certain influence on people's life and health. During the first frost, the weather is changeable, so people need to take corresponding protective measures according to the weather conditions to keep healthy. At the same time, the first frost is also a good time to see autumn scenery, where people can enjoy the last beautiful scenery in autumn.