Status
Resolved
Issue description
Snow does not work in custom dimension, if a biome is cold enough for it snow in, weather wont work at all. Note that this only works if every biome is cold enough for snow, if it isnt, it will snow and weather will work, but if every biome is cold enough for snow in the dimension, it wont work. Here is a custom dimension showcasing it, go in and do /weather rain and see that it wont work.
This command only works in the overworld as WorldInfo that controls all weather is defined in the overworld.
Start rain in the overworld using weather command and then go into your dimension. This is what I saw: