The speaker describes a winter that has stripped the world down to black and white, and the loss feels bigger than just scenery. In that bleakness, they say they forgot how to see and even how to live, as if the dullness of the season had crept inside them and numbed them.
The sharpest turn comes in the last two lines. The "saddest news" is that we may have continuing summer. That sounds odd, since summer is usually welcome, but here it reads as a warning. The poem seems to hint at a warming climate, where winter itself might disappear. The speaker's bleeding suggests real grief over that prospect. The mood is quiet, numb and sorrowful. Winter is hard, yet its loss is the greater wound, and the poem leaves us with that uneasy reversal rather than an easy answer.