I was unaware...

[Fairytale]

I had rain too, but I didn't know that it was special..

 

[Wholockian]

Once... Just once when I was island hopping

 

[Libra]

I've seen it rain on my island once, but I think it was also raining in my town so I didn't pay that much attention to it, actually. (Not sure if I'm remembering correctly that it rained in my town, it was several months ago and I was kinda TT'ing since I was looking for bush starts.)