What does cold dew mean in the twenty-four solar terms?

The meaning of cold dew in the twenty-four solar terms is a solar term that reflects the characteristics of climate change.

Cold dew is one of the twenty-four solar terms and the fifth solar term in autumn. The meaning of cold dew mainly reflects the decrease of temperature and the increase of chill, as well as the growth of crops. When entering the cold dew, there is cold air going south, the temperature difference between day and night is large, and autumn dryness is obvious. After the cold dew, the cold air in the north has a certain influence. Most parts of China are under the control of cold and high pressure. At the end of the rainy season, controlled by cold and high pressure, it is warm every day and cool at night, and the air is crisp in autumn.

From the climate characteristics, in the cold dew season, the autumn in the south is getting stronger, cool and cool, with little rain and dryness; The vast area in the north has shown the scene of winter. In a word, cold dew is a solar term reflecting the temperature drop and crop growth, which has an important impact on agricultural production and people's daily life. In the cold season, people should pay attention to keep warm and add clothes, and strengthen the prevention of colds and respiratory diseases. At the same time, you can also enjoy the beautiful natural landscape in autumn.

Introduction of meteorological changes of cold dew;

Cold dew is the end of the full moon in the dry calendar and the beginning of the full moon. At night, looking up at the starry sky, you will find that the "Big Mars" (Antares) representing midsummer has sunk into the west. After the cold dew, the height of the sun continued to decrease and the temperature gradually decreased. Cold dew is called "cold dew" because the temperature is much lower than that of Bailu solar terms, and cold produces dew condensation. There is a proverb in China called "Dew first turns white and then cold", which means that after the dew festival, the dew turns from a little coolness in early autumn to a little coolness in late autumn.

There is also a proverb about cold dew: "Cold dew spans three dynasties, and you need to find a bridge after crossing the water", which means that the weather is already chilly and you can't wade across the river or go to the fields barefoot as before. During the cold dew, people can obviously feel the change of temperature difference. From white and crystal dew to freezing cold, it vividly reflects the continuous decline of temperature. As the cold intensifies, everything becomes dim.