As a Bay Area native, it would be sacrilegious to not include Karl the Fog on the best cloud list. Karl makes Bay Area summers truly lovely by allowing the sun to shine and provide excellent daylight warmth, while cooling down the Bay in the evening to make sleeping cozy and pleasant. Karl also visualizes the beauty of the fluid dynamics of the marine layer as it pushes through the Golden Gate and over the hills of the Penninsula almost every evening.
(The music is Nardis by The Bill Evans Trio)