Winter Season Definition Jun 2026

Astronomical winter is determined by the Earth's position relative to the sun. It begins on the —the moment a hemisphere is tilted at its furthest point away from the sun.

The definition of the varies significantly depending on whether it is viewed through an astronomical, meteorological, or ecological lens. While broadly understood as the coldest period of the year, its specific start and end dates shift based on the tracking system used. 1. Astronomical Definition winter season definition