IT'S THE MAINS. The current cleans up considerably at night when every other power hungry so and so is fast asleep. Try running a power regenerator like PS Audio and you will likely hear the same. Enjoy!
The speed of sound is directly proportional to the speed of light. When it is dark, the speed of sound increases because it is trying to find the light which is not there. When you see the light, you will understand the truth of my statement... grasshopper!
Ok I know I can't be the only one that knows this but, at night there is more moisture in the air due to less heat. More moisture means more density in the air, more density means more sound transferance. That is why you can hear traffic at night at much farther distances, voices, and dogs barking.
Sorry ibehere, but although the relative humidity might go up when the air gets colder, that does not mean that there is more moisture in the air, just that the air is colder containing the same amount of moisture as before. Its dew point remains the same. One can hear voices or dogs better at night because there is usually less background noise to drown out those quiter sounds. Nothing to do with moisture in the air. Bob P.
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