What does the first frost mean?

The first frost is the eighteenth of the twenty-four solar terms and the last solar term in autumn. Fight with your fingers; The solar calendar is 210; Celebrate every year on Gregorian calendar 10 year1October 23rd-24th. 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. On the national average, "first frost" is the season with the largest temperature difference between day and night in a year. ?

Weather characteristics of the first frost.

The first frost solar term is in late October. At this time, there are frequent cold air activities in northern China. With the continuous attack of windy weather, the temperature drop is more and more obvious. During the first frost, the temperature difference between day and night is increasing. In case of cold wave, the temperature can reach above 10℃, which will cause discomfort to human skin and respiratory system. Some people who are old and weak and have been ill for a long time are also prone to catch a cold or aggravate the original disease.

After the first frost solar terms, cold air activities become more frequent, and the temperature difference between day and night becomes larger. The "first frost" solar term has nothing to do with "first frost", which does not mean that entering the first frost solar term will lead to "first frost". In fact, "frost" does not fall from the sky, but the water vapor on the ground condenses when it meets cold air due to temperature difference changes.

There is no concept of "first frost" in meteorology. Generally speaking, the first frost in autumn is 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.