When is the solar term behind the cold dew?

The solar term behind the cold dew is the first frost The first frost is one of the twenty-four solar terms in traditional festivals in China. The "first frost" means "the weather turns cold and the first frost appears, which is the last solar term in autumn and also indicates the beginning of winter. At the same time, after the first frost, the temperature difference between day and night gradually increased. The first frost usually occurs on the 23rd day of the Gregorian calendar 10 year 10. In ancient China, the first frost was divided into three stages: "One stage was that the jackal sacrificed animals; Second, the vegetation is yellow; Three stinging insects are salty. "

The first frost is the eighteenth of the twenty-four solar terms and the last solar term in autumn. Fight with your fingers; The longitude of the sun is 2 10. After entering the first solar term in first frost, the scene of late autumn is obvious, and cold air moves southward more and more frequently. 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. Because "frost" is a manifestation of cold weather and large temperature difference between day and night, it is named "first frost", which means "sudden drop in temperature and large temperature difference between day and night".

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 solar terms in the first frost mainly include the customs of enjoying chrysanthemums, eating persimmons, climbing high and overlooking, and tonic.