NO SUPPORT FOR BLEEDING EDGE!
To enable mods in Bleeding Edge you must get SPT source code, change it to enable mods and make your own build. If you do not know how to do this - it is not for you. Use stable version, unless you know how to modify source code and compile your own build.
I'm not sure what OP was looking for here but I'd love to know how to simply kill the fog on the latest BE release if you happen to know where the weather section is located.
WeatherConfig values can be edited with mod, but nods are disabled in BE builds.
You are free to make your own BE build with mods enabled or hardcoded new values at WeatherConfig.js if you know how to do this.