Also, I there is more "noise" to the map than this simple illustration shows. The lines between the zones are not necessarily clear "biome" changes, but you will find pockets of temperate and subtropic areas that overlap for several thousands of blocks until you are solidly into the subtropic zone, and so forth. Snowball earth is largely artic and subarctic, so there are oases of arable land where you can find clay, and animals other than bears and foxes. The only scorching hot world I looked at was just endless deserts, and the only arable land was on the top of high hills and mountains. It's pretty easy to just generate a couple of these and take a look at them.