A map showing the location of tundras. (http://www.windows.ucar.edu/earth/images/tundra_map_big2.jpg)
There are two types of tundras:
Arctic tundras are found north of the Arctic Circle. This includes areas such as: Canada and Alaska, Siberia, Greenland, and northern Europe.
Alpine tundras are located at the top of tall mountains above the tree line, or timberline, which is any natural division above or beyond which trees do not grow, as on mountains or in polar regions. Polar means near the North or South Pole. (EO Experiments: Tundra Biome, par. 7)
The tundra is cold!
The average yearly temperature is a chilly -12C to -6C. (Tundra topics, par. 3)
In the arctic tundra, "the sun does not rise for nearly six months of the year". (Major Biomes of the World, par. 3)
The average yearly precipitation (water falling from the sky as rain, snow, sleet, hail, etc.) is 15-25cm, including snow. (EO Experiments, par. 2))