Hoar frost (also called radiation frost or hoarfrost or pruina) refers to the white ice crystals, loosely deposited on the ground or exposed objects, that form on cold clear nights when heat losses into the open skies cause objects to become colder than the surrounding air.
There, a definition copied straight from wikipedia. Hoar frost happens around here when we are coming into pre-spring thaw. We get up in the morning, and it is especially warm for as frozen as everything is. Usually accompanied by interesting fog formations. Following are pictures taken just a few mornings ago of hoar frost and the fog.
These two are just prior to sunrise.
The next two are just as the sun is peeking.
WHAM! THE SUN.
Hoar Frost
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