Rime frost

Occurs when the rate of frost formation is rapid, usually under conditions of high water content in the air (vapour and/or liquid) and at least moderate wind speeds. It forms by ice crystals growing on exposed surfaces in moist, freezing conditions. Surfaces could be rocks, boulders, cairns, fences, foliage etc. Rime is denser and harder than hoar frost and “grows” in the direction of the prevailing wind. Compare also with cornices, which are snow and “grow” towards the leeward side of ridges and cliffs.

About Cameron Speirs

Born and brought up in the Scottish Highlands, Cameron, has been interested in outdoor pursuits since he was a wee lad. Over the last few decades he has climbed extensively in the Italian Dolomites as well as summiting the Matterhorn and several other 4000m alpine peaks. Closer to home he has spent many wonderful weekends mountaineering and biking in Snowdonia, Cairngorms, Glen Coe, Skye and Lochaber.
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