Minecraft wiki entry for Snowfall, associated text: Snowfall is a temporary, biome-specific occurrence that can happen randomly at any time in snowy biomes. In stony shore and windswept hills biomes, snowfall only occur above layer 120. In taiga and old growth spruce taiga, snowfall occur only above layer 160. Snowfall occurs above layer 200 in old growth pine taiga. Snowfall also occurs in frozen ocean biomes, where it only occurs in certain locations, while it rains in others, as a result of a temperature gradient within the biome. In lush biomes, snowfall can occur only at layers above the block height limit. Snowfall does not exist in hot/dry biomes and in other dimensions.