What does it mean that the first frost has changed before the cold dew is cold?

The cold dew is not cold, and the first frost has changed, indicating that the temperature of the first frost is low. 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, which shows that the climate is cold during the cold dew solar term, but the weather during the cold dew solar term is far from that during the first frost solar term. The first frost solar term temperature is generally below 20, and even light snow begins to float in the northern region. Therefore, the real cold weather in autumn depends on the first frost solar terms.

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, which shows that the climate is cold and cool during the cold dew solar term, 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 solar terms

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 turns into the sky." 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 "Su Qi condenses and dew becomes frost", which means 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.