Ghost's "The Fog" describes a single night and morning in a city. White mist drifts slowly and silently through the cold dark, and the street lights glow only faintly inside it. Then the sun comes up, and the fog thins out and disappears.
The speaker seems calm and quietly admiring. The plain line "This is natural beauty" stops the description for a moment, as if the speaker wants to say outright that fog, which many people find gloomy, is something lovely. The repeated sounds of "slow," "low," and "moved silently" make the mist feel hushed and gentle.
The last line gives the poem its warmest image. The fog is an "embrace," though a cold, white one, and the morning "releases" the city from it. That suggests the night was both comforting and confining. The overall mood is still, mysterious, and peaceful, with a little relief when the light returns.