Unity3D nothing but distortion when playing audio clips - audio

Question

I'm having a lot of trouble with playing audio clips. I suspect it has something to do with update playing my clip from the start every time it executes the block of code that sends the clip to the audio source. Below is a 'solution' but the fact that it works doesn't even make sense to me. If I just put the audio.play() in the main if statement without checking whether it's less than the audio clip length, I hear nothing but a quiet distortion.
void Update()
{
switch(weatherState)
{
case WeatherStates.Sunny:
break;
case WeatherStates.Rain:
Rain();
break;
case WeatherStates.Snow:
break;
case WeatherStates.ThunderStorm:
break;
}
}
void Rain()
{
if(timeScript.hourOfWeatherEvent != 0)
{
if(timeScript.hourCount >= timeScript.hourOfWeatherEvent)
{
rain.SetActive(true);
if(soundCount < weatherSounds[0].length)
{
soundCount++;
audio.clip = weatherSounds[0];
audio.Play ();
}
timeScript.durationOfWeatherEvent -= Time.deltaTime * timeScript.timeSpeed;
if(timeScript.durationOfWeatherEvent <= 0)
{
rain.SetActive(false);
timeScript.durationOfWeatherEvent = 0;
timeScript.hourOfWeatherEvent = 0;
weatherState = WeatherStates.Sunny;
}
}
}
}