In "Dust of Snow," the "dust of snow" refers to the small, almost insignificant flakes that fall from a tree and settle on the poet. This minor natural occurrence unexpectedly alters his mood. Initially, the poet seems burdened by gloom or a negative outlook, but the simple act of a few snowflakes touching him changes his perspective, lifting his spirits and imparting a sense of renewal. The poem suggests that even the smallest moments in nature can have a profound impact on one’s emotions, turning a day filled with melancholy into one of hope and light.