This is 100% better than Serene Seasons, but one thing that really breaks the immersion from me, is the transition from winter and exploring new chunks, there is a very harsh cutoff of ice and snow. I'd like to turn off auto-snowing and let the weather handle it, or have an option to fade the snow in so it's not so jarring. Think of how biome borders look, like perhaps that kind of effect, a dithered fade, or perhaps, both?

This. I want the ability to turn off snowing in not snowy biomes during winter.

That is not what I am requesting. I'm requesting the ability to turn off the automatic snowing, meaning when you load a chunk during the winter that it automatically has snow.

I don't like the way fabric seasons handles this. The harsh snow borders look ugly and out of place.