I had some rare time in front of the computer today and happened upon this pic. I realised a few years ago that B/W conversions thrive on good light and for me, being a landscape photographer it means "soft light" at sunrise or sunset.
But, I have gathered, deduced and concluded over the years that between 11 and 2pm when the sun is at it's brightest and trying to kill everything with his rays is the time when the powder puff clouds are out and everything just comes together for a striking B/W pic.
Not that this is but a nod to harsh midday light, that has it's uses.