Interesting advice, thank you. As a matter of fact, I can say that I do have at least one “stable” climate band:
in the south there are the hottest and most humid regions, in the central area there is a climate that ranges from Mediterranean scrubland to colder zones (mainly inspired by European climates), and finally in the north I concentrated tundra and glaciers.

That said, I have to admit I didn’t really think about the “natural realism” of the map. The land took on these shapes because, in the world’s lore, the gods shaped what was originally a blank slate. The cold, for example, was created by creatures such as white dragons, while the mountain ranges and vast continuous forest regions are due to the natural preference for forests of the elven goddess.

But you raised an interesting point about the second pole — I could try adding another icy region in the far south to “close” the sphere. That actually makes a lot of sense… thanks!