What do the solar terms and the first frost in the 24 solar terms mean? Why is the first frost called the first frost?

1, the first frost solar term means that the weather is getting colder and first frost begins. To the south of latitude, the average temperature is around 16℃, and there are three solar terms before the first frost day. In the southern valley of South China, frost can only be seen in the dead of winter. Of course, even at the same latitude, the temperature and humidity of the air close to the stratum are different due to the difference of altitude and topography, and the first frost period and frost day are also different. In the first frost season, the cool autumn wind blew to Guangzhou, the flower city. The average temperature in northeast China, eastern Inner Mongolia and most parts of northwest China has been below 0℃. "In mid-September, the gas was cold and condensed, and the dew was like frost." Every year, around Gregorian calendar 10 year 10 23rd, when the sun reaches longitude 2 10 degrees, it is the first frost. At this time, frost has appeared in the Yellow River Basin of China, and pieces of silver ice crystals are shining in the fields thousands of miles away. At this time, the leaves turned yellow and colorful.

2. The first frost means that the weather gets cold and it begins to frost. Meteorologically, the first frost in autumn is generally called "first frost" or "first frost", and the last frost in spring is called "late frost" or "final frost". The interval from the last frost to the first frost is a frost-free period. Some people also call the first frost "Chrysanthemum Frost", because chrysanthemums are in full bloom at this time, and Su Shi, a great writer in the Northern Song Dynasty, said in a poem: "All trees are sweeping away pornography, and only Furong is alone."