As much as I love Cathedral Weathers & Seasons, it has one annoying problem: the rain and thunderstorm weathers... don't look great. They're much too bright when they should be dark and gloomy. Specifically, the volumetric lighting and lens glare are set much too high in weathers where they should be either low or off.
To address this, I did two things. First was to copy all the rain/fog weathers from Obsidian Weathers and Seasons, which has vastly superior rain/fog, and import them into a separate ESP. Because Cathedral Weathers was built off of the Obsidian Weathers code, and they both use only the vanilla weather values, this doesn't cause any incompatibilities. The second was some manual tweaking. I used commands to view all the rain/fog weathers in-game, and make unique modifications to most of them (which almost exclusively involved tweaking the settings for volumetric lighting, sun intensity, and lens glare).
The only requirement is Cathedral Weathers. Do not install Obsidian Weathers. Just place this ESP after CW&S in your load order and you should be good to go.
This is the first iteration of this mod, so please report any bugs you find or any improvements I can make.