Despite the potential diversity of climates in the ET category involving precipitation, extreme temperatures, and relative wet and dry seasons, this category is rarely subdivided. Rainfall and snowfall are generally slight due to the low vapor pressure of water in the chilly atmosphere, but as a rule potential evapotranspiration is extremely low, allowing soggy terrain of swamps and bogs even in places that get precipitation typical of deserts of lower and middle latitudes. The amount of native tundra biomass depends more on the local temperature than the amount of precipitation.
The city of Ushuaia on the southern tip of Argentina is notable for having an ET climate according to the Köppen classification, because its warmest month (January) has a mean temperature of 9.7 °C (49.5 °F), while at the same time having no months with a mean temperature below freezing. The coldest month (June) has a mean temperature of 1.7 °C (35.1 °F).