What is the standard in winter?

The meteorological winter standard is that the average daily temperature is lower than 10℃ for five consecutive days after winter, and the first day of these five days is winter.

There is no doubt that the average temperature in the last two days and today is lower than 10℃, mainly depending on the performance the day after tomorrow. Beginning of winter means that anger begins to close and everything enters a state of recuperation; Its climate, wind and rain, humidity, temperature, etc. At this time, it is at a turning point, and the climate changes from autumn to winter. The traditional four channels reflect the characteristics of phenology and climate change.

At present, the four seasons are often divided according to temperature changes, regardless of phenology, rainfall, light and other factors. Adopting the method of "climate average temperature" proposed by modern scholar Zhang Baokun. According to the four seasons divided by the climatic average temperature method, the average daily temperature for five consecutive days is equal to or lower than 10 degrees Celsius, which is regarded as winter. Winter means that the temperature has steadily dropped below 10℃, which means the weather is cold.

Definition of winter time

In China, traditionally, the four seasons are set as the starting point. For example, winter begins in early winter and ends in early spring. In the west, the division of the four seasons is based on the dichotomy of taking the sun as the starting point of the four seasons, such as taking spring as the starting point and summer solstice as the end point; Winter solstice to spring is divided into winter. These four seasons are one and a half months later than the traditional four seasons in China.

After winter, it is generally dominated by northeast wind and north wind, and the temperature gradually decreases, from less rain and dryness in autumn to rainy and cold weather, and it will snow in some places. At present, the method of "average temperature" is often used to divide the four seasons in China. If the average temperature is lower than 10℃ for five consecutive days, it is counted as winter. The four seasons divided by climatic average temperature method are basically consistent with the temperature changes in mid-latitude areas.