The rain chance is currently 15% which is way over the top for most game sessions, just 5% would probably be a big improvement. Same with night and fog, where they should be fun and rare occurrences these are mostly just nuisances.
Constant rain is noisy, too frequent to be charming but more importantly it fucks over your stats unreasonably (and in arguably the least welcomed way), snow still has that irritating rain sound effect, night often makes it too straining on the eyes to be really enjoyable during daytime and fog regularly extends round time beyond justice, when the mandatory one or two stragglers have to be sought out in the haze.
Though currently oversaturated, on the premise of low(er) frequence these could all be great and fun game mechanics.