Taiga. Temperature: 0.25 Featuring Spruce Trees, Flowers, Ferns, Wolves - gamepedia.com 
A biome densely filled with spruce trees, fern and large fern. Wolves tend to spawn here fairly commonly - gamepedia
Taiga, also known as boreal forest or snowforest, is a Biome characterized by coniferous forests consisting mostly of pines, spruces and larches.
Jack London Lake at Kolyma, Russia - wikipedia
The taiga is the world's largest terrestrial Biome. In North America it covers most of inland Canada and Alaska as well as parts of the extreme northern continental United States, where it is known as the Northwoods.
In Eurasia, it covers most of Sweden, Finland, much of Norway, some lowland/coastal areas of Iceland, much of Russia from Karelia in the west to the Pacific Ocean (including much of Siberia), and areas of northern Kazakhstan, northern Mongolia, and northern Japan.
Mountainous version of the snowless Taiga biome.