Mod works when all players have it, but only one has to use the ability and it will change for everyone.
Snow one didn't work for us but all others did.
Additional Information
I tested it with someone else who had the mod, they didn't use the ability only I did but it worked correctly for both of us and synced the weather.
Mod information
Download link*
https://www.nexusmods.com/skyrimspecialedition/mods/22485?tab=files
Dependencies
None
Compatibility