20 15 when will the weather turn cold?
Autumn is one of the four seasons. In China, traditionally, "beginning of autumn" in the 24 solar terms is taken as the starting point of autumn. Entering autumn means that rainfall and humidity tend to decrease or decrease, and everything in nature begins to mature from lush. ?
According to the average climate temperature of modern scholar Zhang Baokun, there are four seasons in a year. The index is that the period when the average temperature is lower than 10 degrees Celsius is winter, the period when the average temperature is higher than 22 degrees Celsius is summer, and the period from 10 to 22 degrees Celsius is spring and autumn respectively.
Climate:
It is autumn in beginning of autumn so far, which means that precipitation and humidity are at the turning point of the year, and there is a tendency to decrease or decrease. In nature, everything begins to grow from lush to rich and mature.
Autumn is the harvest season, and many plants mature in autumn. In autumn, in nature, the qi of yin and yang begins to change, the yang is gradually declining, the yin is gradually flourishing, the climate turns from hot to cold, and everything is born with cold and gradually declines. This is the season of alternating hot and cold.
Refer to the above? Baidu Encyclopedia-Autumn