What's the change of solar terms in beginning of winter?

The weather gets cold and the ground temperature drops. The "beginning of winter" solar term is1October 7th or 8th every year, 165438+. In ancient China, people used to regard beginning of winter as the beginning of winter. All winters don't start at the same time except the coastal areas of South China where there is no winter all the year round and the Qinghai-Tibet Plateau where there is no summer in long winter. According to the standard of dividing the four seasons by climatology, if the average temperature in the second half of the year falls below 10℃, it is winter, then the statement that "beginning of winter begins in winter" basically conforms to the climate law in Huanghuai area.