Who knows the specific climate performance of the solar term' autumnal equinox'?

The autumnal equinox is one of the twenty-four solar terms of traditional festivals in China. It falls on September 22nd or 23rd of the Gregorian calendar every year, when the sun reaches 180 degrees. The meaning of the "twenty-four solar terms" in the autumnal equinox: "See the vernal equinox in mid-August". "Divide" means to divide day and night equally. Like the vernal equinox, the sun shines directly at the equator of the earth, and day and night are equal. Since then, the position of direct sunlight has moved south, and the days in the northern hemisphere have gradually shortened, the nights have become longer, and the temperature has dropped, which is of universal significance throughout the country. In ancient China, the autumnal equinox was divided into three periods: "When thunder comes, the sound will stop;" Second, wait for scorpion blank households; Wait for the water to dry. "It means that it thunders because the sun be the spirit is strong. After the autumnal equinox, the yin qi begins to flourish, so it no longer thunders. At the autumnal equinox, "fen" means "half". At the autumnal equinox, the world is as long as day and night. After the autumnal equinox, the days are getting shorter and shorter in the northern hemisphere, and the nights are getting longer and longer in the southern hemisphere. China's ancient book "Spring and Autumn Stories, Yin and Yang in and out" said: "The autumn equinox, Yin and Yang are also half-phase, so it is cold and hot day and night. "The characteristics of the autumnal equinox The autumnal equinox solar terms are special among the 24 solar terms. There are two main characteristics: first, the sun reaches the longitude of the Yellow Meridian 180 degrees on this day, and directly hits the equator of the earth, so the 24 hours of this day are equally divided, each being 12 hours; There is no extreme day and night phenomenon in the world. Secondly, according to the method of seasonal division in ancient China, which took beginning of spring, Changxia, beginning of autumn and beginning of winter as four seasons, the autumnal equinox lived in autumn for 90 days and divided the autumn equally. The climate of the autumnal equinox At the autumnal equinox, most parts of China have entered a cool autumn. The cold air from the south meets the warm and humid air that gradually decays, resulting in continuous precipitation and the temperature dropping again and again. As people often say, it's time for "an autumn rain and a cold", but the daily precipitation after the autumnal equinox will not be great. At this time, the field farming in the south and the north is different. In northern China, there is an agricultural proverb that says: "The white dew is early, the cold dew is late, and it is the right time to plant wheat in the autumn equinox. "Proverbs clearly stipulate the time for sowing winter wheat in this area; And "White clouds come in autumn equinox, good songs and good rice seeds are everywhere" reflects the planting time of rice in Jiangnan area. In addition, the working people's taboos on the autumnal equinox solar terms are also summarized as proverbs, such as "The autumnal equinox is only afraid of lightning, how much is it?" "