Meteorology, what is the temperature of all seasons in a year to be considered as entering that season?

At present, the method of "waiting for average temperature" proposed by modern scholar Zhang Baokun is often used to divide the four seasons in China. Taking the five-day average temperature as the standard, the five-day average temperature after winter passes 10℃ and begins to enter spring. When the temperature is higher than 22℃, it means the end of spring and the beginning of summer.

Climatic average temperature refers to the weighted average of daily average temperature for five consecutive days, which is an important index to divide the four seasons, that is, winter is the time when the climatic average temperature is less than 10℃; Above 22℃ is summer, and between them is spring and autumn.

It starts in winter when the average temperature keeps falling below 10℃ and in summer when the average temperature keeps rising above 22℃. When the average temperature rises steadily from below 10℃ to above 10℃, it is regarded as beginning of spring. Autumn begins when the temperature drops steadily from above 22 degrees Celsius to below 22 degrees Celsius. That is, the average temperature in winter is less than10℃; Spring10 ~ 22℃; Summer ≥ 22℃; In the autumn of 22 ~ 10℃, this seasonal method can be combined with the specific climate and agriculture in various places, so it is used more.

Seasonal division index: when the average temperature is lower than 10℃ in winter; Summer is when the average temperature is greater than 22℃; Average temperature in spring and autumn10℃ ~ 22℃; The average climate temperature reaches 10℃, which is roughly consistent with the date when peach blossoms first bloom and willow trees turn green. When the average temperature reaches 22℃, cicadas sing sweetly, which is a sign of entering summer; When the average temperature drops below 22℃, as the date of going to Qiu Lai in summer, it is consistent with the scene of swallows coming from south to autumn.