Quote Originally Posted by dragonseth07 View Post
You're not making it up. Remember how everyone kept on about how new the snow was in Coerthas Central Highlands?
Yep - this is the canon explanation.

When Dalamud descended and Bahamut appeared and tried to lay waste to Eorzea, it seriously messed with the aether in a number of areas, and since aether is tied up with the elements this shifted the kind of weather patterns present. Coerthas now suffers from a shift in the ice-aspected aether which caused a flash ice age of sorts, whereas Drybone is dealing with (I presume) a shift in water-aspected aether, hence the frequent rain.