>>12480160When the air is very cold it's also denser, and high frequencies carry noticeably more efficiently, especially for very distant sources. Children, whose hearing at higher frequencies is more acute, notice this effect more readily than adults do. (One thing I remember is how much more crisp the whine of jet engines and the squeal of janky brakes in the distance sound, a difference I still notice during January cold snaps, but not as often as I used to.) On the surface of Titan where the pressure is a little higher but the atmosphere is a whole lot denser due to the much lower temperature, this effect would be more pronounced still. As for whether someone floating in the atmosphere of Jupiter at an altitude where the pressure is about the same as that at sea level on Earth, would hear a tremendous constant rumble from faraway lightning (as much as 1000X more powerful than the largest on Earth) is one of those questions I haven't been able to find a ready answer to. Some of the Venera probes were equipped with microphones, so it's known to be rather quiet on the surface Venus, probably because what lightning there is on Venus happens only at very high altitudes where the pressure is much lower: The sound of them is probably attenuated both by distance and the pressure difference to far below the sensitivity threshold of even today's best professional recording equipment.
