This isn't a complete fix just something that will make the Biome shifts from the updates more tolerable. Make it so the rain melts snow and ice. So when there is a Biome shift the snow and ice in the old winter Biomes goes away. Because right now it is kinda stupid seeing a Biome covered in snow and ice and it starts raining, and they are still there when the rain stops.
This would be something nice for those of us who don't want to delete our worlds everytime a new update comes out.
I'd rather they keep the original seed's weather patterns, rather than change to the new weather pattern when a TU comes out with a Biome shift.
This could be controlled through the use of tracking Biomes allowed when spawning the world as was suggested in another thread (Expanded World Generation Options) to allow users more control over which Biomes appeared on world Generation.
The only intrinsic problem I see with this suggestion is that it would only be applicable to arctic areas only once after a Biome shift... and instead of having the rain 'melt' the snow... you may as well just code the game to arbitrarily melt the snow if the climate is too warm to support snow.
Because right now it is kinda stupid seeing a Biome covered in snow and ice and it starts raining, and they are still there when the rain stops.
Sooo... you've never been to Alaska, I take it? I live in a (Real Life) biome where this happens, can't really find it that unusual... not common, but not unusual either. It's about the only time our schools close down...we have snow days when the temperature goes above freezing (Water + Ice is not friendly driving conditions).