I completely understand what you mean with Burmecia, and the idea that a weather effect should add something to the game or the story, not just be there for no reason.
In the case of my game, the village where it takes place is under a curse that makes time stand still, so there's no wind, no rain, no birds or other animals making sounds... The moment it starts raining later in the game is meant to suggest that the curse is starting to break.
I only use fog for the introduction — I find it annoying during actual gameplay.
And regarding the language, I’m thinking of translating it into English soon. It will be a lot of work, but I believe it will be worth it.
Thank you so much for your feedback, and have a great day!