According to the Blu-Ray's Pandorapedia, there are desert, boreal, and polar regions on Pandora. If I'm reading it right, it said that the deserts are "equatorial", which means they are in the equator area of Pandora, so I imagine with Pandora's temperatures, the desert region would be almost unlivable for humans, except for the Na'vi that lived there. It's also there that the information of Na'vi with differing adaptations comes into play. Maybe in the sequal we'll get to see the desert and polar regions of Pandora, as well as it's oceans.
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