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The possessive apostrophe is required in both cases; the snow and the light belong to “winter” and “day” respectively. The apostrophe goes before the -s.

  1. The beauty of winter's first snow.
  2. The day's final light.

If days were meant to be plural, the possessive apostrophe should come after the -s, however, I would also recommend adding an adjective, or any qualifier, before the noun just to clarify.

  1. The autumn days' final light.
  2. The final light of autumn's days. (paraphrased)
Mari-Lou A
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