極性またはツンドラの気候ゾーンとしても知られる寒い気候ゾーンは、非常に寒い気温と短期間の成長期を特徴とする地域です。この気候ゾーンは、通常、北極および南極の地域を含む地球の極の近くの高緯度で見られます。寒い気候帯では、気温は一般に年のほとんどが凍結を下回り、雨の形にはほとんど降水がありません。植生は草、苔、地衣類に限定されており、土壌には木や他の深い根の成長を防ぐ土壌に永久凍土の層があります。寒い気候帯には、ホッキョクグマ、ペンギン、北極キツネなど、さまざまな冷たい動物もあります。
The cold climatic zone, also known as the polar or tundra climate zone, is a region characterized by extremely cold temperatures and a short growing season. This climate zone is typically found at high latitudes near the Earth's poles, including the Arctic and Antarctic regions. In the cold climate zone, temperatures are generally below freezing for most of the year, and there is little precipitation in the form of rain. Vegetation is limited to grasses, mosses, and lichens, and there is a layer of permafrost in the soil that prevents the growth of trees and other deep-rooted plants. The cold climate zone is also home to a variety of cold-adapted animals, including polar bears, penguins, and arctic foxes.