From posts here I'm getting the feeling people are expecting the sequel to be set in a warmer climate, but there is evidence to the contrary, that's at least if Josh isn't planning to subvert his own lore.
From the strategy guide:
The Eastern Reach is a region in the southern hemisphere, named so by Aedyran colonists. It is the part of Eora in which Pillars of Eternity takes place, an area maybe a little smaller than real-world Spain.
We don't know the size of the planet or its distance from the Sun, but if it's comparable to Earth's, as you go south, it should be quickly getting colder, not warmer.
When I was at school, they used to teach us that for a picture to be called a map, it has to have two things - a scale, and a sign which way is North. PoE's official map does not have a scale. Sloppy as usual.
I made a selection of the Eastern Reach, slapped it on top of a Spain map where the scale had been noted, and resized and turned, until it was relatively fitting to the scale of Spain. Then I measured the width of one of the little house symbols designating a city/town. It was equal to about 20 km. I used this as a measure, to know how much 20 km would be on the original unresized map of The Eastern Reach. Long story short, the distance by air from Defiance Bay to Revua should be around 624 miles or around 1005 km. That's just about the distance from Washington to Quebec City. That's roughly how much colder it should be, if we disregard other variables determining the climate or consider them roughly equal.
I've also asked Josh on his tumblr, to see what distance he will give.