Rain in dry places

With this datapack rain can fall in the desert, savanna, badlands and all their variants (see below).

How it works:

This datapack replaces some biome files with modified versions that change a single line concerning precipitation. This means if it rains or snows anywhere in the game it also rains in those modified biomes.

When adding this datapack to an existing world, it has to be loaded (of course) and the world needs to be reentered for rain to appear. The same goes for disabling the datapack.

Changed Biomes:

badlands, desert, eroded_badlands, savanna, savanna_plateau, windswept_savanna, wooded_badlands

Limitations and Issues:

Due to this approach the datapack also overwrites a biome's data for terrain generation, spawns, etc. and should therefore only be used in the correct minecraft version. Should any other datapack in use also replaces those biome files for badlands, etc., they will conflict.

In the latter case you can fix this yourself, by unpacking the other datapack, going to data\minecraft\worldgen\biome, and changing the value of single line in the biomes' .json files (listed above):

"has_precipitation": false -> "has_precipitation": true

This way your other datapack will allow rain in desert etc. without needing this datapack in the first place.