I was always told that it just didn't snow in Arizona. Obviously I was mistaken.
It's just that it's a rare event that far south and at that elevation. The southern part of Arizona is on the same line as the middle of Texas, and all of Florida is south of Arizona.
Has it ever snowed in Hawaii? I'm pretty sure it's never snowed in Puerto Rico.
Answer: Snows on the volcanos. Puerto Rico, no.