It's worth noting that the reason why Coerthas has snow is because when Dalamud dropped, all the aether in the air dicked-up the climes and made it cold.
In other words, it's Magic Snow.
Outside of Coerthas in places that should be roughly the same longitude, it isn't even snowing (Dravania, for instance).
So if we know that climates are influenced by aether (honestly, what isn't in this setting?) then we can't really use geographical position to get a good hold on what it would be like.
There's some concept art, though.
EDIT: Regarding belly-windows, Ishgard wasn't always the frozen hell it now is, so it might have been a little more sensical to have a belly window once upon a time.
If there's any reason to object to having a belly window, it's because you're fighting dragons and they can stab you.
In other words, it's Magic Snow.
Outside of Coerthas in places that should be roughly the same longitude, it isn't even snowing (Dravania, for instance).
So if we know that climates are influenced by aether (honestly, what isn't in this setting?) then we can't really use geographical position to get a good hold on what it would be like.
There's some concept art, though.
EDIT: Regarding belly-windows, Ishgard wasn't always the frozen hell it now is, so it might have been a little more sensical to have a belly window once upon a time.
If there's any reason to object to having a belly window, it's because you're fighting dragons and they can stab you.
