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

[Azélor]

But before this, how does one decide what is the level for each area? This isn't clear.

I based my "model" on pure observations.
Take an example, the border between the color yellow and green on that map http://www.cartographersguild.com/at...7&d=1440511271
The 0°C isotherm is located roughly at 35°N is Asia and North America. But much further north in Europe and on the American west coast. Thus these area have different influences (ALSO CALLED TEMPERATURE CATEGORIES), the first two are continental, and the others are oceanic.

I am aware that my method feels clumsy (clumsy for lack of a better word).
But it's the best i manage to get.
The ideal solution would involve mathematic algorithms, like that maybe : http://www.cartographersguild.com/sh...t=26931&page=2