Introduction of first frost

The first frost is the eighteenth of the twenty-four solar terms and the last solar term in autumn.

The longitude of the sun is 2 10, and it meets every year on Gregorian calendar1October 23-24. After the first frost entered the solar term, the scene of late autumn was obvious, and the cold air went south more and more frequently. The first frost does not mean frost, but refers to the sudden drop of temperature and the large temperature difference between day and night. On the national average, the first frost is the season with the largest temperature difference between day and night in a year.

In the first frost season, when it's time to end, it's all over. When the sun goes down to the ground, Yin Qi begins to condense, and the first frost weather gradually turns cold. Because first frost is a manifestation of cold weather and large temperature difference between day and night, the first frost is named after this solar term, which means that the temperature drops sharply and the temperature difference between day and night is large. The first frost solar terms are characterized by cold weather in the morning and evening, hot noon, large temperature difference between day and night, and obvious autumn dryness. The first frost solar terms mainly include enjoying chrysanthemums and eating persimmons.

Meteorological change

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. 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 frost solar term, the cold air activities affecting our country have become more and more frequent, and the temperature difference between day and night has increased rapidly, especially in Jiangnan and South China, and the temperature fluctuation has become more and more obvious, while some areas in the northwest and northeast have shown the scene of cold wind and falling leaves in early winter.

During the first frost period, from the end of June, which is usually 10, to the beginning of 1 10, with the dry and cold air gradually dominating the whole country, warm and humid air is marginalized, and many weather with the characteristics of summer and early autumn exits, and the weather is relatively simple. Before and after beginning of winter, strong winds often cool down, and some places enter winter in a short time.