I had the pleasure in witnessing a beautiful moon ring last night after looking out my window late into the night. I've seen this type of moon ring before but haven't seen it officially advertised as happening at a certain point in time, other than knowing it happens in the winter months. 

I did a bit of reading into this before and I read something about 22 degrees being the cause of the light catching crystallised air which would make sense why it only happens in winter. Even though I don't fully understand it, sometimes that is exactly what makes it so special.