Snow is usually found in taiga and snowy plains biomes and it is caused by snowfall and slowly covers the ground and structures. It is most common at the tops of large mountains, particularly in the mountain biome.
Layers of snow (via screenshot)
Snow is naturally generated in snowy biomes and its amount on the ground increases over time if constant snowfall occurs. The only way to pick up snow is by using a shovel enchanted with Silk Touch. Destroying snow with a non-Silk-Touch shovel will drop one snowball per layer.
Any other tool, even if enchanted by Silk Touch, destroys the snow and drops nothing. Players can also craft snow by using three snow blocks and placing them in a horizontal line across the crafting grid.
Snow is mostly a decorative block that will cover most blocks and they cannot be placed on ice blocks. They also melt away if a heat or light-emitting block is close enough. If the snow keeps piling on and reaches the height of a block it will turn into a snow block, which can be picked up with a shovel enchanted with Silk Touch.
Snow placed on a rooftop as decoration (via screenshot)
Snow blocks can e found in the mountain, taiga, and snowy plains biomes. They are both naturally generated and post-generated due to snowfall. To pick up snow players must use a shovel enchanted with Silk Touch. Snow can be used as a decorative block by covering up the top of blocks.
A. You will need to place three snow blocks in a horizontal line in the crafting grid to make snow.
A. Players and all entities will sink in powder snow blocks if they walk over it.
A. If the lantern is within a three-block distance of the snow if will melt the snow.