I guess it boils down where you would place peak winter, the winter solstice where the night is longest or somewhere in late January where the temperature is coldest. Since a season is 3 months, subtracting 1.5 months from the peak of winter would give you the beginning of winter. Subtracting 1.5 months from late January gives you early December, which is two weeks off from the winter solstice, so close enough.
Depends on where you're from. In China, the winter solstice is the middle of winter. Winter in China started in early November.
I guess it boils down where you would place peak winter, the winter solstice where the night is longest or somewhere in late January where the temperature is coldest. Since a season is 3 months, subtracting 1.5 months from the peak of winter would give you the beginning of winter. Subtracting 1.5 months from late January gives you early December, which is two weeks off from the winter solstice, so close enough.