I'm using Galaxy S3 with 4.1.2 firmware.
I have yet to really customize my phone and would probably go with GO launcher soon.
Downloaded this free weather app by GO and I had to uninstall it because of some inaccuracies.
Great app just waiting for an update from the developer.
Give Nova Launcher a try. I like it wayyy more than GO (which is good) mainly because it's super customizable.