The snow is extremely ugly in non-rendered chunks after winter is over. I am not a programmer or a developer, so this may not be possible. Though, I had an idea of how you could fix the ugly post winter snow. What if during winter, there was like a 'state' of winter depending on how long it has been going. So if it is a little bit through winter, and it has snowed, other chunks would update in relation to that. And when it becomes spring, the snow would disappear slowly, with a percentage, and all chunks would update to this percentage of how far the snow is gone. So when it is farther into spring, and you rendered a chunk that was last rendered in winter, it would update to the snow being 100% gone, and the snow would disappear before you would really notice it. Feel free to ask me if you don't understand. I am not the greatest at explaining things. It would also be wonderful if you made this compatible with weather2. Thank you very much for reading this!

There's already an open issue for this (As well as a PR that implements it waiting for us to test and approve it).

As for Weather 2, it's on them to make it compatible, not us.