Sounds good, but the differnt biomes do not have ANY impact on gameplay. As far as I have seen, biomes , while visually attractive, do not impair or prefer a capability. You can build a farm in snow as well as in a desert as well aws in a swampy area; there is always a type of trees growing, elephants survive even in the arctic - all well justified in the interest of balanced gameplay. Just the biome itself does not seem to contribute at all.
A "4-seasons biome" would impact strategy only if you could not grow a farm in a desert or in snow (you would probably have to revert to animal breeding instead), or your elphants or camels have alimited lifetime in the cold, or the like. So if you would change from one biome to another you'd need to consider this effect.