click the fog button in windows
then go to fog settngs and at the bottem there is kid of a grey colour click that and choose your colour then your fog should apear whatever colour you have choosen and then there is a thing where you put how thick you want the fog an there is another thing bring that up and click fog so it is of and you should have whatever colour sky
if i did not explane it well then ask peter he taugh me
-Click Windows at the top
-Choose Fog
-When the Fog window appears, check "Display Fog" and uncheck "Use background color" to enable changing the colors
-Click the default beige color icon on the right
-Another window will popup. Choose your new fog/background color. I use H: 208, S: 28, B: 100 for a nice sky.
-Back at the main Fog window, drag one bar at 0 and one at infinity for just a blue background with no fog. I like to bring the infinity down just a notch for a little fog so buildings have some distance to them.