Keeping things on track, remember we don't have the resources to go and seriously revamp seasons. Things like rivers freezing just aren't going to happen. It requires new code, and then you have to start considering, which rivers etc though I suppose that since travel times all increase we generally assume that all continents are located such that they have European style winters.
This is kind of a tough concept. Compare the effect each season has in southern Italy/Greece to Scandinavian nations. Even places as close together as Austria/Switzerland vs Baden-Württemberg Germany makes a noticeable difference. If this is the way we need to look at it then climate descriptors like "Southern Mediterranean" should be removed/adjusted.
