Custom wind, rain and weather system with sparkling water droplets shader.
Finally all that work writing a custom vegetation shader is paying off. This has allowed adding water droplets on leaves, complete with sparkly light refraction/reflection effects and subsurface translucency. Plus better wind speed blending without jittering. Doing this in a 3rd party vegetation shader would be very hard to impossible if they did not provide full source.
In the future I plan to add some sort of exposure system. Staying out in the rain can't be good and should encourage you to build a shelter.