Clouds are too big not to make some sort of noise. There's something wrong about watching enormous meteorological forces at work without a soundtrack to underline their actions.
As the huge cumulonimbuses cruise like tall ships overhead they should emit a low, ominous hum. The little scudding cumuluses should pip-pip-pip their way from horizon to horizon. Lazily slow and high cirruses should tinkle like glass beads falling down a staircase, only just audible above the breath of the wind. Boiling, swirling storm clouds should fizz, slowly impinging on the consciousness. Fog's just white noise.
The novel peace and quiet would be just one more reason to like clear, blue, sunny days.