Tundra

Tundras were a cold biome, which existed in the game prior to the Adventure Update.

Description
Snowy, barren terrain with very few trees. The occasional trees do exist, though very rarely. Ice can be found over water. Snow is a common weather in tundras. It generates when the temperature is below 50% and the rainfall is less than 20%.

History
In Beta 1.8, Notch also said that this biome would be left out until Beta 1.9. This is because snow was causing problems with the new biome generator.