Update for game version 1.59
New realistic skies
Realistic rain intensity
Realistic rain textures
Realistic tree textures
Realistic road textures
Realistic mountain textures
Complete weather system
Realistic rain
Realistic rain intensity
More than 10 levels of rain intensity
Multiple fog intensities
Realistic weather with fog
Realistic rain effects
Realistic rain sounds
Realistic thunder sounds (more than 40 high-quality sounds)
Realistic thunder sounds like this

Credits:
trainguy_modding