If Terran/D'Hara are Mediterranean and Madina is Carribean, then that makes Barca something like... well, something like Kentucky, really. I hear there are people who can tell us what's that like.
The only snow that falls in Terran is in the Phantarian forest in the north, and even then it's not deep. We've always RPed Odona as basically a jungle; Thysan too.
Evanburg and the west might be cooler... but still not THAT much cooler. I'm not sure how the Orvandeaux RP their climate. I hope subtropical. :/
Barca's furthest west might get some snow in winter, but I have a hard time imaging maple trees and such in Rettlewood.
Also, Terran's players, when they are RPing seasons, tend to refer to winter as monsoon season. We're really into this whole tropical thing. We dig the palm trees and stuff.