In W. Köppen's 1936 climatic classification it is one of the polar climates, defined as having a mean temperature for the warmest month of less than 10°C (50°F) (in contrast to snow forest and temperate rainy climates) but higher than 0°C (32°F) (which is the limit of perpetual frost climate). Tundra is designated ET. Tundra climate appears as a temperature province in C. W. Thornthwaite's 1931 classification.
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