This is definition of on czech version of wikipedia for winter season: It is the coldest season of the year. The days are short and it gets dark early. In many countries there is snow and ice. Plants stop growing and trees are without leaves. Some animals grow bushy fur that protects them from the cold. Other animals sleep all winter.
Astronomical winter begins in the northern hemisphere of the earth at the moment of the winter solstice (21 or 22 December). On this day, the longest night and shortest day. At this time, starts at the Earth's southern hemisphere astronomical summer.
Meteorological winter begins on 1 December and ends on 28 February (leap year, February 29).
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