Minecraft wiki entry for Snow_Golem, associated text: As they move, they leave a trail of snow on the ground if the blocks can support it.[5] If a snow golem is on a hopper or if the mobGriefing game rule is false, a snow trail does not appear. They produce snow only in biomes having a temperature less than 0.81, which includes cold, snowy, and temperate biomes (including the End but not jungle).