I'm using Piva's New Weather Mod (or something like that, I'm not sure if this name is correct). You need to put it above ProMods in the mod list.
However, it causes some problems with temperature in Iceland for example, where there's around 20 °C in the snowy regions. But if you don't look at such details, it's a pretty nice mod
![Smile :)](./images/smilies/icon_e_smile.gif)
and it has nice skyboxes, too.