If anyone would still like to play Avgani on Arma 3 and get rid of the black sky you can use this patch to remove it. Its just a very simple modification of Jack Ost's Black Sky global patch. You need the original Avgani map and, since it's an Arma 2 terrain, you also need CUP. To use it you install the mod and in the editor pick the Avganifix terrain instead of the regular one. Weather won't work but it's certainly better than just black sky.   All credit goes to Jack Ost for the original patch, thanks!   Download here: https://drive.google.com/file/d/0B4p8_jE5xz2yWHVwZEdJZVE2ajA/view