Winter

Winter is the coldest and darkest season of the year in temperate and polar climates. It occurs after autumn and before spring, when the hemisphere is oriented away from the Sun as a result of the tilt of Earth's axis. Different cultures define different dates as the start of winter, and some use a definition based on weather.

In the fields of horticulture and botany, the term deciduous () means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed leaves, usually in the autumn; to the shedding of petals, after flowering; and to the shedding of ripe fruit. The antonym of deciduous in the botanical sense is evergreen.

hypothetical climatic effect of nuclear war

temperature anomaly event caused by a volcanic eruption

tires designed for use on snow and ice

hypothesized extended period of worldwide cold weather due to the impact of a celestial body on the Earth's surface

school break in winter

kind of garden maintained in wintertime

wheat sown in the fall, persisting through the winter as seedlings, and harvested the following spring or summer after it reaches full maturity

animal hibernation chamber in zoology