When is winter?

20 10 1 1.7 beginning of winter on the second day of the 10th lunar month. Beginning of winter is one of the 24 solar terms in China. The ancients believed that from this day on, China officially entered the winter. And the old saying goes: September is not frozen, October freezes to death! Most years are frozen in September of the lunar calendar. Isn't it winter if it freezes?

Now, with the development of science, the definition of solar terms is more scientific, and the average temperature for five consecutive days is above MINUS five degrees, which is defined as winter! ! ! It can be seen that the real winter can only be obtained through actual temperature measurement! ! !