I don't know what the precise conditions were that allowed for this. I know I've never seen anything like it before. These perfect specimens were very lightly blanketing the Jeep on the morning of Dec. 11th as I was taking Brookie to preschool. It was certainly cold enough to preserve these throughout the night. But why did they only barely stick to the windshield and not blow off? Most were on an edge - hardly any laid flat against the glass. How did just this small sprinkling occur and not more? What was the window of time available for me to see this spectacle, and why was I so fortunate? How rare is this? I wouldn't say this was life-changing, but I was pretty humbled by the event.