Climatic characteristics of Bailu solar terms

1, large cooling range

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.

The cold and warm air are evenly matched.

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 origin of Millennium solar terms;

"White Dew" is a festival that reflects the temperature changes in nature. Dew is a unique natural phenomenon after the solar term of "White Dew". The weather at this time, as the Book of Rites said: "The cool wind comes, the dew falls, and cicadas sing." The ancients also said in Xiao Weijing: "The fifteenth day after the summer is white dew, and the yin is getting heavier and heavier, and the dew condenses into white."

In fact, meteorology shows that at this time of the solar term, the weather becomes cool and the sun is still very hot during the day. However, as soon as the sun returns to the mountains, the temperature will drop rapidly. At night, the water vapor in the air will condense and form tiny water droplets, which are very densely attached to the green stems, leaves or petals of flowers and trees, showing white color, especially after being irradiated by the morning sun light, which makes them look more crystal clear, thus gaining the reputation of "White Dew".