I have seen perfect 6-pointed snowflakes that were 1-2cm diameter many years ago. I was crossing a remote mountain pass in the Sawtooth Mountains of Idaho in Se

I have seen perfect 6-pointed snowflakes that were 1-2cm diameter many years ago. I was crossing a remote mountain pass in the Sawtooth Mountains of Idaho in September when the temperature dropped precipitously and it started snowing heavily, which was very unexpected at the time. In this case though, the snowflakes were stunning, almost the platonic ideal of a 6-pointed snowflake at huge sizes. We actually pulled over to watch it, it was pure magic. I have never seen anything like it before or since. I didn’t think snowflakes like that were a thing that could actually exist, despite being depicted that way. I’ve seen a lot of snow in many locales but to this day it was a singular experience. Since I have never seen that type of snow anywhere else, I have to wonder how much the extremely anomalous conditions that caused the snow storm contributed to the exceptionally rare form of the snowflakes.