Does the first frost belong to autumn or winter?

The first frost is the solar term in autumn.

In the northern region, the weather is already very cold during the first frost solar term, and the frost word in the first frost sounds very cold, which makes people think it is a winter solar term. Actually, it is not. The first frost does not mean "frost", but refers to the sudden drop in temperature and the large temperature difference between day and night. The first frost is an autumn solar term, but the first frost solar term is the tail of autumn and the closest solar term to winter. After the end of the first first frost solar term, it has entered the beginning of the winter solar term and officially entered.

The first frost is the last solar term in autumn and the transition from autumn to winter. In the first frost season, everything is finished, everything goes to heaven, the sun goes to the ground, and the yin begins to condense. The cold weather began with the first frost. Yizhoushu Zhou said: "Autumn and March are empty: summer, autumn equinox, first frost."

Meteorological changes of the 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.

During the first frost period, it usually lasts from late June 10 to1early October 10. As dry and cold air gradually dominate the whole country, warm and humid air is marginalized, and many weather with characteristics of summer and early autumn exits, so the weather is relatively simple. Before and after beginning of winter, there were often strong winds and cool weather, and some places entered winter in a short time.

Baidu Encyclopedia-First Frost