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In page Microthermal:

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Under the original Köppen climate classification, all places with an average temperature in their coldest month that is colder than -3 °C (26,4 F), are said to have a microthermal climate. The isotherm of -3 °C for the coldest monthly mean temperature, was observed to be the line where the climate was likely cold enough to support a fixed period of continuous snow cover every year.[citation needed] In recent usage, an isotherm of 0°C (32°F) is commonly used instead. Either definition places almost all of the world's microthermal climates in the Northern Hemisphere, as the absence of broad land masses at upper-middle latitudes in the Southern Hemisphere precludes, with few exceptions, the existence of such temperature conditions there due to the sea moderating temperatures.[1]