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Refraction of sound occurs when parts of a wave front travel at different speeds. This can happen when there are uneven winds or temperatures.
For Example:
On a warm day, the speed of sound is faster. The air close to the ground is warmer than the air above it, and that causes sound to bend away from the ground. This gives the impression that sound travels shorter distances.
On a cold day, the speed of sound is slower. The air close to the ground is colder than the air above it, and that causes sound to bend towards the ground. This gives the impression that sound travels longer distances than in warm weather.
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