…”flat, leaden skies, intermittent rain. Damp and dark. And dull.” ~ Mike Johnston
IMO, IF YOU ARE GONNA DO MONOCHROME, you must embrace the world in all its weather glory cuz, to paraphrase Paul Simon, all the world's not a sunny day, oh yeah. And I might add, iMo, if you can’t make a rainy, cloudy day look like more than dull, maybe monochrome ain’t your calling.
Then again, I am not a monochrome guy, so what the hell do I know about it?
FYI, BW conversion in Photoshop / LAB Color Space.