The speaker looks back on a Christmas walk through the snow with someone they loved, and the memory is still sharp. They remember the person's snow-white hair and their hands, cold to the touch but somehow welcoming. Those small details show how closely the speaker was paying attention, and how much they treasure them.
The ending is where the poem turns. The speaker admits the love "was not forever," then closes with a striking image: the warmth of that love "melted you away." Snow and winter usually suggest coldness, but here the love is the warm thing, and it is what destroys the person it surrounds. The white hair hints that the loved one may have been old, and the melting could be a gentle way of describing death, though the poem never says so outright. Either way, the mood is quiet and tender, with a sadness that comes from loss rather than anger. The short lines and plain wording make it feel like someone speaking softly, holding on to one cold, bright day.