Is the Millennium solar term still hot? What's the weather like during the Millennium?

Around September 8 every year, people will usher in the fifteenth solar term of the year-the Millennium. It is called "White Dew" because although the weather is getting colder and colder, the sun is still hot during the day, and the temperature drops suddenly after the sun sets, so that the water vapor in the air condenses into small white dew at night. Entering the Millennium season, the weather will change to some extent, so today's calendar will introduce you, is it still hot in the Millennium solar terms, and what the weather is like during the Millennium.

After entering the Millennium solar terms, the summer monsoon is gradually replaced by the winter monsoon, the cold air turns to attack, and the warm air gradually retreats. 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. Continuous rainy weather often occurs in the eastern part of Southwest China, South China and West China. There may be heavy rain caused by tropical weather system (typhoon) in the southeast coast, especially in the south China coast.

In addition, autumn drought, forest fire and first frost may also occur in some areas at this time. 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. There is a proverb that says, "There is no drought in spring, and the drought in autumn is halved. Building houses in spring drought and breaking grain in autumn drought. "

In some northern areas, such as Shaanxi, Shanxi, Gansu, North China and other places in the northwest, autumn precipitation is inherently less. If severe autumn drought occurs, it will not only affect the harvest of autumn crops, but also delay the sowing and emergence growth of autumn sowing crops and affect the harvest of the following year. In addition, with the autumn drought, especially the dry air and the increasing wind in mountainous forest areas, the forest fire risk in autumn began to enter a period of high incidence.

"On August 15th, the wild goose gate opened and the geese came with frost on their heads." Frost is caused by the invasion of cold air. The daily average temperature is above 0℃, and the surface temperature drops below 0℃. The water between crop cells freezes, constantly absorbing the water in the cells, leading to cell dehydration and crop withering or death. Sometimes, although there is no frost on the surface of plants, crops will still be frozen because the surface temperature is below 0℃. This phenomenon is called black frost and it is also a kind of frost.

The average date and area of the first frost in the Millennium are: early September: northeastern Xinjiang and eastern Inner Mongolia. Mid-September: northern Xinjiang, central Inner Mongolia, and central and northern Heilongjiang. Late September: The first frost will appear in parts of southern Xinjiang, most of Gansu, Ningxia, northwestern Shaanxi, northwestern Shanxi, northern Hebei, and north-central Northeast China. The first frost affects the quality and yield of soybean in Northeast China, causing freezing injury to cotton, sweet potato and corn in North China and affecting the yield. Early September: Northeast Xinjiang and East Inner Mongolia. Mid-September: northern Xinjiang, central Inner Mongolia, and central and northern Heilongjiang. Late September: The first frost will appear in parts of southern Xinjiang, most of Gansu, Ningxia, northwestern Shaanxi, northwestern Shanxi, northern Hebei, and north-central Northeast China. The first frost affects the quality and yield of soybean in Northeast China, causing freezing injury to cotton, sweet potato and corn in North China and affecting the yield.

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