I think what you mean to say is "What falls from the CLOUDS in the winter." Though It's just a guess. The sky really doesn't do much by itself in any season, much less be the "container" for the changing temperatures, whereas clouds in the winter (depending on where you live) will drop snow (pieces of frozen water) if it's cold enough or rain (non-frozen water) if it's warm enough.
erm, snow...
The white stuff that often falls from the sky in the winter time made of water and crystalized ice. This mixture must stay a at least thirty five degree or lower.
The white stuff that falls from the sky is snow. Snow forms when water vapor in the atmosphere freezes into ice crystals and falls to the ground. It commonly occurs in colder climates during the winter season.
Rain, snow, sleet, and hail are common types of matter that can fall from the sky. These forms of precipitation occur when water vapor in the atmosphere condenses or freezes and falls to the ground due to gravity.
Rainfall is typically around the same temperature as the surrounding air when it falls from the sky.
You may be referring to snow. If you come from a climate where you have never seen it, it is water vapor frozen into whitish-colored ice crystals, and in winter, it falls in flakes onto the ground.
rain is when wet falls from the sky and in England it tends to rain a awful lot!
snow
Precipitation
Niagara Falls in Winter - 1908 was released on: USA: July 1908
winter
Niagara Falls in Winter - 1912 was released on: USA: 8 February 1912