Snow biome

Snow biomes are generated in all worlds created between 15th and 31st December, or in a 1 in 3 chance at any other time of the year. Snow Blocks are generated in place of grass and dirt, and trees have snow cover on them. Water does not turn into ice. As long as there are enough Snow Blocks, a snowfall animation will remain until you leave the biome. Contrary to belief, Snowmen will not spawn in this area by default.

History

 * Early mention: Terraria 1.1.1 Preview! It's a Winter Wonderland! 8th December 2011