The tundra is a biome between the coldest parts of the Arctic or Antarctic and the temperate climates found e.g. in Northern Europe and southern Canada. The characteristic feature of tundra is the permafrost—in summer, only the surface will thaw, but below the surface, the ground is frozen.
, or Barrow, Alaska](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/Barrow_beach.jpg/440px-Barrow_beach.jpg)
This biome is known for its large, grassy plains where it never gets hot due to the latitude; it is to a large part beyond the Arctic Circle. Tundra regions are more remote than temperate grassland regions, and trees are scarce or absent.
On the right is a graph showing average temperatures (Fahrenheit) for Nome, Alaska. The dotted line that goes through the center of the graph marks freezing temperature, . Climates that fail to consistently pass freezing temperature in summer are classified as ice cap climates, and exist primarily in Greenland, the Arctic, and the Antarctic, although all of these regions have tundra climates as well. The difference is that most ice cap climates have permanent ice and snow cover, often hundreds of metres deep, while tundra climates are mostly ice-free (on the surface) in summer. Tundra climates are barely habitable, while ice cap climates are uninhabitable and typically only visited for scientific purposes.
At these latitudes you might see aurora borealis (or australis), and the midnight sun if you're north of the Arctic Circle.
Tundra appears most commonly on latitudes between 55 and 75 degrees. In the northern hemisphere, most of this band is part of North America, Europe and Asia.
In the southern hemisphere, these latitudes are mostly covered by ocean. Tundra-like conditions appear in Patagonia, on islands in the Southern Ocean and the fringes of Antarctica itself.
Remoteness has its own risks, and means help is not easily available in emergencies. The cold weather, which dominates the region, makes this problem only worse. The tundra provides little shelter in case of severe weather. Make sure you plan your trips adequately, have appropriate clothing and gear, and have experienced company.