Is it cold in autumn equinox?

After the arrival of the autumnal equinox solar terms, the weather will start to get cold.

On the occasion of the autumnal equinox, most parts of China enter a cool autumn. The southward cold air meets the descending warm and humid airflow, which produces precipitation again and again, and the temperature drops again and again. As people often say, "an autumn rain and a cold", the daily precipitation after the autumnal equinox will not be very large.

The Yangtze River basin and the vast areas in northern China have successively entered autumn, and the daily average temperature has dropped below 22℃, and the cold air mass in the north has begun to have a certain degree of intensity. In most areas, the rainy season has just ended, the breeze is blowing gently, and the blue sky is like washing. However, Guangdong and Hainan will gradually cool down until 10 to 1 10 ends. After the autumnal equinox, the sun shines directly in the southern hemisphere. The northern hemisphere receives less and less solar radiation, while the ground emits more and more heat, and the temperature drops faster and faster.

The origin of the autumnal equinox solar terms:

Every year around September 23rd, when the sun reaches longitude 180 degrees, it enters the "autumnal equinox" solar term. The autumnal equinox is the sixteenth of the twenty-four solar terms. After the autumnal equinox, the position of direct sunlight moves south, and the days in the northern hemisphere are short and the nights are long, with a large temperature difference between day and night, and the temperature drops day by day.

In ancient China, there were two meanings of the "autumnal equinox": one was to divide the four seasons according to beginning of spring, Changxia, beginning of autumn and beginning of winter in ancient China, and the autumnal equinox fell within 90 days of autumn, which was equally divided. 2. At this time, 24 hours a day are divided equally, each 12 hours. This day is the same as the "spring equinox" day. On the day of the "autumnal equinox", the sun is almost directly at the equator. After that, the position of direct sunlight moved south, and the days in the northern hemisphere became shorter and the nights became longer.