Before the last weather update I used to run a few commands using timed executable to stop fog.

"weather.fog 0": 900,

"weather.clouds 0": 900

I see the new command is weather.fog_chance “0.?”

Can I put weather.fog_chance “0.0” is the server config or bat to stop fog ever spawning. Or would I need to run the command every 15 mins using timed executable like before ?

surely someone knows how to remove fog from Rust?

I think you had it in your first post.  Putting weather.fog_chance 0 in your config should do it.