Source identified1
“Snow-bound in woodland, a mournful word, Dropt now and then from the bill of a bird, Reached me on wind-wafts.”
A winter bird-call reaches the speaker inside a snowbound wood, giving a postponed meeting an atmosphere of distance, waiting and subdued natural sound.
Source note: “Postponement,” collected in Wessex Poems and Other Verses (1898), Project Gutenberg #3167. The poem's landscape frames a delayed relationship encounter and is not generic weather description.