The arctic coast of Alaska and Canada have tundra climate and vegetation. Winters are long and bitterly cold, while summers land is huge.
The Rocky Mountains and the Pacific rangers have highland climate and the vegetation. Temperature and vegetation vary with elevation and latitude. Generally the temperature is colder and the vegetation is more sparse in the higher, more northerly mountains.
The mountains also influence the temperature, and precipitation of surrounding lower areas. In the U.S.A, the western mountains trap pacific moisture. This makes lands west of the mountains rainy and those west very dry.