When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day ?

Explanation

Time =`("Distance")/("Speed")`
i.e., Time is inversely proportional to the speed. In any medium, as we increase the temperature the speed of sound increases. Thus on a hot day due to high temperature the speed of sound increases. Hence the time decreases. So we can hear the echo sooner.