(Dfb, Dwb) with longer summers.

According to some sources, the boreal forest grades into a temperate mixed forest when mean annual temperature reaches about 3 C. Discontinuous permafrost is found in areas with mean annual temperature below freezing, whilst in the Dfd and Dwd climate zones continuous permafrost occurs and restricts growth to very shallow-rooted trees like Siberian larch.

Growing season

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