I'm still just looking at the first day of our Yellowstone adventure. It was 7 degrees F that day. Brr for an Oregon person! But the rime frost on the trees was gorgeous. Hoarfrost: buildup of ice (in the form of crystals, often delicate and feather-shaped) when water vapor in the air condenses as ice on a surface. In short, the main difference between rime and hoarfrost is that rime is the result of freezing fog, Hoarfrost forms in the absence of fog.
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