Thoreau writes in his journal:
P.M.—Skate to Lee’s Bridge and there measure back, by pacing, the breadth of the river. After being uniformly overcast all the forenoon, still and moderate weather, it begins to snow very gradually, at first imperceptibly, this afternoon,—at first I thought I imagined it,—and at length begins to snow in earnest about 6 P.M., but last only a few minutes . . .