Not sure if its a glitch or another mod might be interfering but no matter how long I wait for snow to pile up it just stays in the one layer like vanilla, I'm running the latest forge, mod version, opitfine and a few other mods. All updated playing 1.12.2 (example serene seasons, OTG, biome bundle ,dynamic trees...). I havent messed with any of the config files in any way, so I'm not sure whats going wrong?

Heres after waiting for an hour just full on snowing, its a normal new flatworld.

Sorry for the late response, the issue is likely due to either the biomes mods or a change in forge that prevented this mod from loading. The snow check is effectively the same as in vanilla, and this mod is extremely simple so there's not a whole lot of places for things to go wrong. That version was compiled for 1.12, but if I have time I may try porting it up to 1.12.2