❄️ Hoar Frost on a Clear Night: Radiative Cooling, Frost Point and Vapour Deposition on Wire, Grass and Leaf

A fence post, barbed wire, grass and a leaf from dusk to dawn: thin objects radiate to the clear sky, fall below the frost point and grow ice crystals. Change cloud, wind, humidity and wire emissivity and watch where, when and in what shape frost forms.