I'll second King, here. Coerthas in 1.0 seemed to me more like a snowless tundra than anything rather than sweeping, warm plains. The snow is actually more likely an imbalance of water aether that is freezing once it hits the already-frigid temperatures. Or, rather, a re-balancing of water aether that was disrupted by Dalamud and the Crystal Tower. I'd wager that Coerthas was always cold, and even colder pre-Allagan meddling.
That being said, though, I dearly, dearly miss 1.0 Coerthas. Those bleak plains were some of my favorite for exploring (inb4 THEY ALL LOOKED THE SAME LOLOLOL).
