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I have observed that the power lines buzz louder when there is less moisture in the air.

Why is this?

If it will help the lines are located on the foot hills of a nearby mountain.

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have a look at physics.stackexchange.com/a/45488/4020 –  Yrogirg Dec 13 '12 at 9:04
    
Thanks @Yrogirg! –  Velox Dec 13 '12 at 14:31
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1 Answer 1

The speed of sound is only about 0.1% - 0.6% faster in dry air than in humid air at the same pressure and temperature, but humid air is also less dense than dry air, so my best guess is that the vibration from the wires couples less strongly to air that has moisture in it than it does to denser dry air.

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