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Hoarfrost

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hoarfrost: see frost frost or hoarfrost, ice formed by the condensation of atmospheric water vapor on a surface when the temperature of the surface is below 32°F; (0°C;). In the formation of frost, a gas (water vapor) is changed directly to a solid (see dew).
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hoarfrost
a deposit of needle-like ice crystals formed on the ground by direct condensation at temperatures below freezing point

hoarfrost [′hȯr‚frȯst]
(hydrology)
A deposit of interlocking ice crystals formed by direct sublimation on objects. Also known as white frost.

Hoarfrost 

ice crystals that form on surfaces on cold, clear, still nights. The particles of hoarfrost are similar in shape to snowflakes but are less regular. Like dew, hoarfrost forms because of the cooling of the surface of the earth as a result of thermal radiation, which causes a drop in the temperature of the adjacent layers of air and the sublimation of the water vapor on the surface, which is cooled below 0°C.



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And in the morning, one will arise as fresh as a lark and look at the window, and see the fields overlaid with hoarfrost, and fine icicles hanging from the naked branches, and the pond covered over with ice as thin as paper, and a white steam rising from the surface, and birds flying overhead with cheerful cries.
The tradition is kept up here that you are the best of skaters," she said, with her little black-gloved hand brushing a grain of hoarfrost off her muff.
The ground from the steps to the river was covered with snow and hoarfrost, the water of the river looked black and deep.
 
 
 
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