What are the characteristics of the first frost and the first frost solar terms?

1, the first frost solar term is characterized by cold weather in the morning and evening, hot weather at noon, large temperature difference between day and night, and obvious autumn dryness. The first frost solar term means that the weather is getting colder and the first frost appears. It is the last solar term in autumn, which also means that winter is about to begin. The Book of Songs says: White dew is frost. Frost is the condensation of water vapor when the ground encounters cold weather, so it is not the frost in the first frost, but the phenomenon that the ground will produce the first frost when the weather is cold.

2. "The first frost in the first frost" reflects the climate characteristics of the Yellow River basin. China has a vast territory, and the time when the first frost appears varies from place to place. The first frost in all parts of China is gradually delayed from north to south and from mountainous areas to plains. Frost will not appear until the beginning of 65438+February in areas around 30 north latitude in the east, Hanshui and 20 north latitude in Yunnan Province. When first frost went from Xiamen and Guangzhou to Baise and Simao, it was the beginning of October after 65438+ years.