Hum hum....I'll try help you as the sky was the last think I understand in the whole game and still trying to -_-".So first you name eg Sky the file.You edit the colors of the Dawn,Day,Dusk,Night and then save them all.You put in the Sky thing in you map the name Sky.For the weather is more complicated -_-"....And hard to explain and unfortunately I can't remember what you do...