I've converted weather workshop from AUM into LITE-C, here it is: Download link It's not the best way to make rain effect, it's pretty slow, but with collusions for each rain drop. Controls: T - toggle snow R - toggle rain F - toggle fog q - toggle day <-> night Screenshot:
I also did it for myself, but did not share because it was not fast enough too, but Djfeeler also did it in AUM100 and as I remember it was fine... at least good for comparison