Possibly relevant to the intensity and quality of sound over the duck marsh in the winter, or Blubberhouses Moor
https://www.sweetwater.com/insync/effects-of-temperature-humidity-live-sound/Because it is less dense, sound passes through hot air faster than it passes through cold air. For this reason, temperature gradients cause refraction effects. Morning is a time when the ground is still cool from the night before but the upper air is already warming due to the sun. Under these conditions, sound can bounce between the gradient and the ground, forming regions of higher and lower sound intensity.
Also, as sound propagates through air, the air absorbs energy from the sound wave, attenuating (weakening) it. The effect is significant only at frequencies above 2 kHz, and increases with frequency. This is the reason why when we hear thunder in the distance it is only a low rumble. The high frequency “crack” has been attenuated more rapidly than the low frequency portion of the noise.
The attenuation of sound in air is affected by the relative humidity. Dry air absorbs far more acoustical energy than does moist air. This is because moist air is less dense than dry air (water vapor weighs less than air).
El mas y mas sordo
