I was born and raised in San Francisco which has a very consistent range of temperatures that don't get extremely hot or very cold. That's one of the things I love so much about living in southern Oregon. We get a bit of snow and several months of frost! It's very interesting to see how frost forms on different surfaces, but the most dramatic tends to be frost on anything metal. I think that may be because metal retains cold so solidly and offers the right kind of surface for fantastic formations like these!