The clear_sky_weather.7z file you have requested: Clear Sky / Mods / Singleplayer / Clear Sky Weather Mod - 170.94kb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R.: Clear Sky and upload any files you want to share or are missing. This is the only information we could locate:
This mod changes the weather in the game to include more and improved fog, stronger winds and night time is improved.