And if the wind is accompanied by rain!

Sometimes the wind directs, dominates, and gives its own rhythm to the roar of water, flinging it violently against walls, windows, and panes. Sometimes instead, it seems that the rain is waiting for the pauses of the wind, then to fall quietly and perpendicularly. At these times, the metallic timbres of roofs and gutters dominate, and the monotonous one of the earth, why a rhythm that is only the rhythm of the rain but still has all the crescendi and diminuendi of intensity through the greater or lesser amount of water falling.

When the rain falls in large, single drops, the general pitch that results is low. When instead it falls in quantity, the noise of the rain is much higher as a general pitch. This explains why the rain is so well attuned to the wind. Indeed, when the wind whistles high and persistently and causes the water to strike with greater force, this clearly raises its pitch, as if to accord with the wind that dominates and directs it. Then, when the wind has stopped momentarily, it resumes its normal, lower pitch.

Russolo, "The Noise of Nature and Life," The Art of Noises 42