The first Weather Iconset for Kustom that I want to present to you is the Kustom Clean Weather Icons Font by +Kevin Welsh on Google+.
Kustom Clean Weather Icons Font
This Icons are adapted from Erik Flowers' Weather Icons project on github and should be free for commercial use.
You can download this Icon Font directly from his Dropbox (Mega Mirror).
More information on Kustom is available here.
The link does not work anymore. Is there any way I could get it now?