If you click on your main DATA file ,SCENE dat. will come up. In that file are all kinds of folders where you can change clouds, sun, wind, rain, fog,etc. Be forewarned, you can really screw things up in there. There's no hand book on what all the files will do. I would suggest building a single mission to test environmental changes, thereby not messing up your main game. I'm no expert, just experimenting like other modders.
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