Soil drainage, slope, and aspect are three major layers that influence the suitability. Not sure if that helps though. One change I'd make is to use a scale as opposed to classes, it probably wouldn't look as extreme.

Not sure about climate change and wine production, but this article may help: https://nuvomagazine.com/magazine/spring-2019/what-climate-change-means-for-the-wine-industry Sounds like it could be good in a way because places too cold for wine would become suitable with increasing temperature. It's difficult to have a single answer though because climate change will affect geographies differently and there's a lot of factors involved.