The meaning of cold dew and frost

Han Dew Ningshuang means to describe the weather getting colder in autumn and dew turning into frost.

Cold dew is the seventeenth solar term of the twenty-four solar terms and the fifth solar term in autumn. Dou Zhi Xin; the sun reaches 195° of ecliptic longitude; the festival occurs between October 7 and 9 of the Gregorian calendar every year. Cold dew is the season of late autumn and the beginning of the Xu month in the calendar of the zodiac. Cold dew is a solar term that reflects the characteristics of climate change. Entering the cold dew, cold air sometimes moves southward, 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 gained some strength. Most parts of China are under the control of cold high pressure, and the rainy season has ended. Controlled by cold and high pressure, the days are warm and the nights are cool, and autumn air is often crisp during the day. From the perspective of climate characteristics, during the cold dew season, the autumn atmosphere in the south is getting stronger, the air is cool and windy, and there is little rain and dryness; the vast areas in the north are already showing winter scenes. The traditional customs of Hanlu include admiring maple leaves, eating sesame seeds, eating crabs, and drinking autumn tea.

Meteorological changes

Cold dew is a solar term that reflects the characteristics of climate change. After the cold dew solar term, the days become shorter, the nights become longer, the sunshine decreases, the heat slowly recedes, and the cold gradually arises. The temperature difference between day and night is large, and it feels slightly chilly in the morning and evening. After the cold dew, the cold air in the north has gained some strength. Most parts of China are under the control of cold high pressure, and the rainy season has ended.

The weather is often warm during the day, cool at night, and clear skies. Thunderstorms have disappeared in most areas of mainland China. From the perspective of climate characteristics, during the cold dew season, the autumn mood in the south is getting stronger, with cool air and little rain and dryness; the northeast and northwest regions in the north have already shown winter scenes, with thousands of miles of frost and thousands of miles of snow drifting, which is completely different from the autumn colors in the south.

As the direct point of the sun continues to move south in the southern hemisphere, the angle of sunlight in the northern hemisphere begins to tilt significantly, and the solar heat received by the ground is significantly less than in summer. The influence of the scope of cold air sometimes Can be expanded to South China.