Winter is one of the four seasons. It comes after the fall.
Winter is one of the four seasons, the season between fall and spring. Astronomically, it is considered to be from December to March, and in China it is customary to refer to the three-month period from the beginning of winter to the beginning of spring, as well as to the three months of the lunar calendar, namely "ten, eleven, and twelve". In the northern and southern hemispheres, the time is different.
In the southern hemisphere, winter is in June, July and August, in the northern hemisphere, winter is in December, January and February. In China, winter begins at the start of winter and ends at the start of spring, while in the West it is common to refer to the winter solstice to the spring equinox. Climatologically, five consecutive days with an average temperature below 10°C are considered winter.
Characteristics of Winter
The establishment of winter, which indicates the beginning of winter since then, is traditionally taken as the beginning of winter with the twenty-fourth solar term, Lidong. In winter, the sun's point of direct sunlight moves southward to the Tropic of Capricorn and then turns back northward. At the time of winter, the sun has reached 225 degrees of yellow longitude, and the earth is located at a declination of -16°19', which makes the sun's altitude in the northern hemisphere smaller, and shortens the length of day.
The northern hemisphere receives less and less radiation from the sun, but because at this time the surface of the earth in the second half of the stored heat there is a certain amount of energy, so it is not yet very cold. Meng winter period, in the clear and windless, often windy and sunny, warm and comfortable "small sunny spring" weather, in the folk "October small sunny spring" said.
In some parts of the south of the early winter this period is generally not very cold, but as time goes by, the cold air frequently south, the temperature gradually decline. Northern regions, before entering the winter to the spring this time are very cold, winter climate change is not obvious in several seasons, snow is the main feature of the northern winter.