Wet linen hung out in the yard in winter freezes. But after a while it becomes dry even

Wet linen hung out in the yard in winter freezes. But after a while it becomes dry even in severe frosts. How can this be explained?

This phenomenon is called sublimation – the transition of a substance from a solid state directly to a gaseous state, bypassing the stage of melting. At a temperature of -30 ° C, the saturated vapor pressure of water is 0.28 mm. rt. Art., which is quite enough for drying clothes.