Hi MR. Farrare
Find out what your maps zone id is and add a line in the game_weather db using something like SQLYog.
If I remember right, you can edit the zone id with noggit. I never tried it yet, all I have worked on has been revamps of existing maps. But I did turn on weather in some maps that did not have any by adding lines to the game_weather db.
edit
I see you are trying what I was thinking may solve your problem, hopefully someone has the info you need to set your zone id.