[thro1]

.. even further (and faster) in hot - not because of temperature - but because of its inversion (which happens as well in Africa -> Atmospheric controls on elephant communication).

Air acoustic impedance vs temperature is 403.2 Pa·s/m at 35°C and 449.1 Pa·s/m at −25°C ( https://en.wikipedia.org/wiki/Density_of_air ).

Air absorbtion/attenuation (because of molecular relaxation..) is a function of temperature, humidity and sound frequency - at 8kHz and humidity: 10% - max at 33°C min at 12°C then grows, 40% - max at 18°C, range .25-5dB/100m (and can be neglected if not for long distances and high frequencies) ( https://www.sfu.ca/sonic-studio-webdav/handbook/Sound_Propag... ).