Minecraft wiki entry for Sky_dimension, associated text: In this version of the Sky Dimension, the buildup of the world blocks-wise is very much like the Overworld, but it is always midday and it does not rain or snow (though cloud cover does appear as if it were raining). Like in the Overworld, there are oak trees, flowers, springs, lakes, and caves, and you can also find pumpkins, mushrooms, dungeons, iron, coal, and gold. Although uncommon, it is also possible to find sugar cane, redstone, lapis lazuli, and more rarely diamond. The only mobs that spawn in the sky dimension are chickens; no other mobs (including hostile ones and squid) spawn, except for monsters spawned by spawners in dungeons. Snow generates on surfaces above a certain altitude, similarly to mountain biomes, however, there is no weather in the Sky Dimension, so this snow is not renewable. Below the islands of the Sky Dimension is nothing but the Void and a layer of clouds.