Terrain temperature: where is it in the ruleset?

I was wondering how does the map generator know that glacier is very 
cold and desert is very hot (and so on), since that information is not 
present in the terrain.ruleset file. Or it is? I can't find it.
Since i want to create a completely new terrain set, i need to know how 
the map generator will behave...

same thing about terrain height...

ps: please Cc: me since i'm not in the list

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