The ilurkers_weather_mod.zip file you have requested: Clear Sky / Mods / Singleplayer / Additional Sunshafts and Weather Pack - 991.69kb 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:
Multiple mod pack with options to remove night, add sunshafts to most weather, and change the frequency weather types occur.