Hello again! This time I would like to suggest a similar mod called '"The Dynamic Surroundings Mod" This mod is a bit bigger and adds more stuff into Minecraft. Again, this mod does not add any physical changes to Minecraft. I might not be able to explain everything this mod has to offer, because of it's size. Now, first, this mod adds different rain levels and a way better, more realistic, and most importantly, not annoying rain sound. Basically how it works is that whenever it rains, it chooses a random number, and depending on that number, it can either be light rain, normal or heavy rain. Secondly, It adds biome sounds. For example, if you are going through any forest like biome, it adds birds chirping. If you are near an ocean, it adds waves. That kind of stuff. I find that to be really cool. If you are in a swamp, it makes the fog level rise a lot and adds some cricket noises, as well as at night. If there is a storm, and you happen to be in a desert at that time, then it just adds tons of particals flying through the air and adds air sounds and also makes it really hard to see. This feature is called a sandstorm. But you guys say that anything that gives you an unfair advantage over players is not allowed. I guess this doesn't give you any advantage. It also adds just different stepping block sounds you don't need to worry about. It also adds fire jets and ocean bubblejets in water or lava. To be honest, instead of me having to explain all of this, just watch the showcase:
And here is the forum page that the actuall creator of the mod made, including all of the features of the mod: https://minecraft.curseforge.com/projects/dynamic-surroundings
-Chilled