Talk:Tyvia/@comment-10592678-20130719160217/@comment-27202257-20130720173415

It is actually possible to grow grapes in less temperate climates, such as the Northern Caucasus of Russia, where most Russian wine is produced. The weather there just happens to be less harsh than the rest of the country.

It's possible that locations further south in Tyvia are more temperate, and are comparable to real-world locations like the Russian Northern Caucasus and Burgundy, France. Looking at a map of the Empire, Caltan in Tyvia is actually on the same latitude as central Morley, and Alexin reaches as far south as northern Gristol. It's possible that these areas are the primary locations for grapes to grow, as they are likely to see better weather conditions than the northern cities. Even then, they wouldn't have to be much better: frost is a common issue in the places I've mentioned, and they still produce, so the same could probably be said for Tyvia.

ETA: Also, as the trivia notes above, Tyvia might parallel a larger portion of North and Eastern Europe, so it might have an even wider range of climates that mentioned here.