The Köppen–Geiger climate classification made simpler (I hope so)

[Azélor]

I do like your table, it look simple and clean.

The keys look alright to me so far.

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I need to go back to what I said initially that was : when climates get colder, less precipitation is require to stay wet.

We have that formula: Precipitation= temperature/2 (+something)
So, every time you move by 2 temperature categories, the minimum rain required move by one
In photoshop, this could translate in having another layer. The original if for the total precipitation, we don't change that. The second and new layer is a modifier added to the original. It take in consideration that more rain is required in hotter climate to stay wet. The first serves only as a reference representing total precipitations and the second represent the ''wetness level'' or ''relative precipitation''?
It could be done by making colder climates appear wetter using the same color scheme as the original.