The poem is clear. What solar terms does Wan Li Frost describe?

The first frost is the eighteenth of the twenty-four solar terms and the last solar term in autumn. "Twenty-four solar terms" said that the first frost: "In mid-September, the gas is cold and condensed, and the dew is frost." At this time, frost has appeared in the Yellow River Basin in China. Thousands of miles away, a silver ice crystal is shining, the leaves are yellow, the weather is getting colder, and the footsteps of winter are approaching.

Meteorological changes of "first frost"

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. On the national average, the first frost is the season with the largest temperature difference between day and night in a year.

After entering the first first frost solar term, the cold air activities affecting our country became more and more frequent, and the temperature difference between day and night increased rapidly. Especially in Jiangnan and South China, the temperature fluctuation is more and more obvious; Some areas in northwest and northeast China have shown the scene of "cold wind and fallen leaves" in early winter.