Why are natural complexes within the same climatic zone so different (for example, in a temperate climate, natural complexes of taiga

Why are natural complexes within the same climatic zone so different (for example, in a temperate climate, natural complexes of taiga, mixed forest, steppe and semi-desert can be distinguished)?

Within the same climatic zone, there is a difference in the average temperatures of January (-20 … -4 ° C) and July (+14 … + 22 ° C), and the humidity of the territory (from excessive to scarce) also differs.

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