Duck-frost

Is it a frost ti-neet? Hey! a duck-frost! Ah fell full smack o' mi feeace.

... duck-frost. In the meadows and along the fringes of the woods the white rime lay thick and powdery on grass and dead leaves; every foot that touched it left a black mark, as if seared with a hot iron, when the sun came up[…]

... duck-frost has given way to a blue sky and a hot sun. The gardener claimed five degrees in the early dawn, and the nasturtiums confirmed it.