No snow in Minecraft?

I know the question has been asked many times, but I've made a map especially for the winter. The problem is there the altitude and the temperature is not right it just rains. Is not there some way to turn the rain into snow?

You can use World Edit to change the biome in the area.

Until 1.12.2 you can do it all with the World Edit Mod. For 1.13 you would have to set up a server and install the plugin.

And does that work on Android (PE version)?

No idea, I do not play.