Hoarfrost

The hoarfrost has not begun to thaw yet.

There are four seasons to Heaven: spring, autumn, winter and summer. Winds, rains, hoarfrost and dew - none of them is bereft of educational implications.

The grass was covered with hoarfrost.

The hoarfrost hasn't yet begun to thaw.

The morning sun makes the hoarfrost on the twigs and branches glisten.

There's hoarfrost on the windows.

[…] It is moſt remarkable on the ſurface of ſnovv, vvhen covered vvith hoarfroſt, and on other bodies vvhere hoarfroſt moſt abounds. In ſuch caſes, I have often found the ſurface to be ſeven degrees colder than the air at the diſtance of tvvo feet; […]

This striking fact, of the lower temperature of the surface on which dew and hoarfrost are forming, it was always found difficult to explain; for the transition of a body from the state of vapour to the fluid or solid form is always accompanied with an evolution of heat, […] The surface is not warmer in consequence of the formation of the dew or hoarfrost, but the dew or hoarfrost is deposited because the surface is previously cold; and its low temperature, compared with that of the air above, is owing to the discharge of heat by radiation.

However, high mountains with a long winter and long dry spells, hoarfrosts and infertile soils are not an ideal environment for some annual crops but are well suited for perennial industrial crops and forest species.