"Winter is the coldest season of the year in temperate climates, between autumn and spring. It is caused by the axis of the Earth in the respective hemisphere being oriented away from the Sun. Different cultures define different dates as the start of winter, and some use a definition based on weather, but when it is winter in the Northern Hemisphere it is summer in the Southern Hemisphere, and vice versa. In many regions, winter is associated with snow and freezing temperatures. At the winter solstice, the days are shortest and the nights are longest, with days lengthening as the season progresses after the solstice."
Winter is the season characterized as the three coldest months of the year (the three warmest in the Southern Hemisphere).
- With the exception of the Eastern United States, the 2014-2015 winter was the warmest winter recorded since records began in 1880.