Sound wave travels faster in the air when it is with the wind. Generally speaking, wind speed is lower near the ground because of the presence of blockages, and so it increases with height (Fig. ... Therefore, when traveling with the wind, sound wave farther from the ground travels faster.
Does wind help an echo?
The wind can slow down or accelerate the speed of sound, depending on whether it is blowing in the same direction or in the opposite direction to the sound signal. For short distances, the wind has no other significant effects on the level of its receipt.
Does the wind affect sound?
Wind's effect is more about distortion of sound. As a sound wave propagates, or moves, through the air, some pieces are accelerated and others slowed down as it meets wind. On a windy day sound waves won't propagate as one distinct wave, so it will be indistinct when it reaches your ear.