The phrase "winter snowfall" refers to the amount of snow that falls during the winter season. Winter is typically defined as the period from December through February in the Northern Hemisphere, and June through August in the Southern Hemisphere. Snowfall occurs when snowflakes made up of ice crystals fall from clouds to the ground due to weather conditions such as cold temperatures and strong winds. The amount of winter snowfall can vary greatly depending on location, altitude, and weather patterns. It is an important indicator for skiers, snowboarders, and those who rely on snowmelt for their water supply.