Cold dew is not cold. What do you mean the first frost has changed?

Cold dew is not cold. The first frost changed. What does this mean?

As the saying goes, "cold dew is not cold, and the first frost weather changes" refers to two different degrees of cold weather. The first frost is the last solar term in autumn. The arrival of the first frost solar term has slowly bid farewell to autumn, and the cold winter is coming, and the sky is getting colder.

Cold dew:

Cold dew is an important solar term in China. When there is cold dew, people will pay attention to the change of temperature. So, isn't the cold dew cold? What's the first frost weather like? What is the proverb of cold dew solar terms? According to the explanation of cold dew in The Moon's Seventy-Two Seasons, "September Festival, when it is cold, it will condense."

It is said that the dew has become very cold, and the glittering and translucent water droplets condense at the low temperature at night. These water droplets are actually the Millennium, which is also inseparable from the solar terms of the Millennium. When you touch the water drops hanging on the grass in the cold dew season, you will feel the cold dew, while in the morning, in lakes and rivers with more water vapor, the water vapor is transpiration and foggy.

Compared with the first frost, the cold dew is not cold at all. The cold dew solar term is the first solar term named after the word "cold" among the 24 solar terms, indicating that the climate during the cold dew solar term is cold and cool, but the weather during the cold dew solar term is far from that during the first frost solar term. In the cold dew season, Nanling and the vast area to the north have entered autumn, and the northeast and northwest regions have entered or are about to enter winter.

At this time, it is already late autumn in the north, with white clouds and red leaves and occasional early frost. In the south, autumn is getting stronger and cicadas are dying. The cold dew solar term is already very cold. As the saying goes, "White dew does not show, cold dew feet do not show." This sentence tells us that the temperature is cold on the surface after the arrival of the cold dew solar terms. As the saying goes, "cold starts from the feet."

First frost:

The first frost is the last solar term in autumn and the beginning of the transition from autumn to winter. As the saying goes, the cold dew is not cold, and the first frost weather changes. At this time, the temperature difference between day and night increases, and the lowest temperature at night can reach about zero degrees Celsius. First, the first frost solar terms followed by the cold dew solar terms, which can be said to be a cold upgraded version of the cold dew solar terms. According to ancient books, the first frost is "qi stagnation condenses and dew turns into frost". What is said here is that water vapor begins to condense into dew, and dew condenses into frost.

There is only dew in the cold dew solar term, but in the first first frost solar term, dew turned into frost. In fact, there is an important factor implied here, which is the change of temperature. Cold dew can only condense into liquid dew during the solar term because the temperature is not low enough. The first frost solar term is already in late autumn, and the weather changes dramatically, which is also a period of frequent cold air activities.

With the continuous arrival of windy weather, the temperature drops rapidly at this time. Everyone should always keep warm to prevent colds. In the first frost solar term, the temperature drops rapidly, and it may drop to the freezing point of 0℃ at night, so the liquid dew condenses into solid frost. Therefore, it can be explained from here that the cold of the cold dew solar terms and the first frost solar terms are two different levels, so it is said that the cold has changed into the sky.

In short, the first frost is the beginning of the transition from autumn to winter. The weather is getting colder, the first frost appears and the vegetation begins to turn yellow. "The cold dew is not cold, and the first frost has changed." At this time, we should pay attention to adding clothes to prevent cold.