Basically you have to select the name of the sky from the first tab in the sky maker. That's stuff where you can edit your sky. Then in a weather tab, you can create a cycle, and I believe at the bottom of that it has things such as LightRain, Rain, Snow. But if you want no weather, I believe you just don't give a weather file. Also if you want to have just normal FH skies like in the rest of the game, then just leave both blank. And maybe you didn't get all the files when you exported it?