Climatic characteristics of the Millennium

The Millennium actually indicates that the weather is getting cold.

The Millennium solar term is one of the 24 solar terms, indicating the change of temperature. "Millennium" refers to the phenomenon of water vapor condensation near the ground caused by the temperature difference between day and night after the temperature drops, and then the water vapor will not condense into dew, but form frost, which is the first frost.

After plants began to have dew entering the Bailu solar term, summer monsoon was gradually replaced by winter wind, cold air turned to attack, and warm air gradually retreated. Cold air going south in batches will often bring a certain range of cooling. People like to use the proverb "it's cold in the autumn night in the white dew" to describe the situation that the temperature drops rapidly.

At this time, the precipitation in northern China is obviously reduced, and the autumn is crisp and dry. During this period, the first autumn rain in the middle and lower reaches of the Yangtze River can often alleviate the previous water shortage. However, if the cold air meets a typhoon, or the cold and warm air are evenly matched, the two sides are in a dilemma, and heavy rain or low temperature and continuous rain are not good for the growth of autumn crops.

The characteristics of the Millennium solar terms:

1, large temperature difference

During the Millennium solar term, when the sun revolves to the position of longitude 165, the sunshine begins to decrease and the ultraviolet intensity decreases. Under the influence of cold air, the temperature drops rapidly at night, and the gap between the highest temperature and the lowest temperature gradually widens.

The obvious temperature difference between day and night began to appear. If the summer droughts in the middle and lower reaches of the Yangtze River, West China and South China are not nourished by autumn rain, summer and autumn droughts may all form.

2. The weather is getting cold.

After the Millennium solar terms, the sun no longer shines directly on the ground, and the winter wind came to China instead of the summer monsoon. Cold air began to wreak havoc and warm air retreated. As the cold air goes south, the weather is getting colder every day, so there is a poem saying, "Millennium is an autumn night, and it is cold all night." It is about the weather changes after the Millennium solar terms.