What is the standard of winter in climate?

In climatology, the standard of entering winter is defined as reaching a certain temperature standard, and the average temperature is lower than 10℃ for five consecutive days.

Winter is one of the four seasons, between autumn and spring. Astronomically speaking, it was from February to March in 65438. China used to refer to the three months from beginning of winter to beginning of spring, and also referred to the "October, November (winter) and December (wax) months" of the lunar calendar. The time in the northern and southern hemispheres is different.

According to the meteorological significance, in the temperate and cold regions of the southern hemisphere, winter is in June, July and August (or May 2 1 to August 22 according to the constellation standard), in the temperate and cold regions of the northern hemisphere, winter is in the solar terms of 12, 1 and February (or according to the constellation standard/kloc-0) Westerners generally call winter the solstice and spring the winter. ?

Extended data

Winter climate change

In winter, the direct point of the sun moves south to the tropic of Capricorn, and then turns back to the north. In many areas, winter means silence and desolation. When the cold current strikes, living things will reduce their life activities, many plants will shed leaves, animals will choose to hibernate, and some are called hibernation. Migratory birds will fly to warmer places for the winter.

In the northern hemisphere, winter is the coldest season, and even the temperature in temperate zone may drop below 0℃. In winter, there will be snowfall in many places, and the snow and ice in most parts of the north will not melt until spring. In winter, the climate is cold, with yin flourishing and yang declining. Affected by the cold temperature, the physiological function and appetite of the human body will change.