Part of the show How We Hear, Echolocation and Giant Whoopee Cushions
Nick in Arizona asked:
Is it true that sound travels further in cold weather than in warm weather and how does this work?
The speed of sound does depend on temperature and it is slower at colder temperatures, so it can sound different. Deep down, sound is the vibration of molecules and if you've got a lower temperature and you meet them, they just vibrate a bit slower.