202 1 first frost is the introduction of the first frost solar terms.
2. The first frost is the eighteenth of the twenty-four solar terms and the last solar term in autumn. At this time, the solar meridian is 210; Salary will be paid every year on the Gregorian calendar 10,123-24 October. The first frost does not mean "frost", but refers to the sudden drop in temperature and the large temperature difference between day and night. In the first frost season, it's all over. From the morning, the sun went down to the ground, Yin Qi began to condense, and the first frost weather became colder and colder. After the first frost solar term, the scene of late autumn is obvious, and the cold air goes south more and more frequently.
As far as the national average level is concerned, the first frost is the season with the largest temperature difference between day and night in a year. 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. The first frost does not mean that entering this solar term will "frost". In fact, "frost" does not fall from the sky, but is formed by the condensation of water vapor on the ground when it meets cold air due to temperature difference.