I downloaded this sky mod: http://videogamemods.com/justcause2/mods/other/Miscellaneous/Realistic-Sky-and-cloud-V.1/. It was supposed to make my sky in game brighter and make it feel more like it was in the summertime. 

It did, but it just wasn't as bright and cheerful as I'd hoped. So I brightened it up even more. It ended up looking pretty good, so I uploaded it. I also included a slightly brightened version of the HD clouds mod. Enjoy.

P.S., if you don't want the clouds, open the zip file, go into "textures" and delete the file called "weather".

And if you don't like it, don't download it.

EDIT: Fixed the clouds by adding the original version. (http://videogamemods.com/justcause2/mods/Map/Textures/HD-Improved-Clouds/).