My most amusing observation of how much this can matter is the obvious obvious pitch/tone change in rail road alerts (at-grade rail crossing signals) on the Met

My most amusing observation of how much this can matter is the obvious obvious pitch/tone change in rail road alerts (at-grade rail crossing signals) on the Metra rail lines around Chicago in the winter. There is a noticeable difference even between 30F and 10F. IIRC correctly (it's been a year since I've been riding the train in the winter), the "beat" of the signal rapidly increases at lower temperatures and the pitch also seems to increase. Edited for clarity.