In Wordsworth's sonnet "Composed Upon Westminster Bridge," Wordsworth describes a view of the city of London early in the morning as the sun is just rising gently into the sky. He finds the scene beautiful and emphasizes the serenity of the great city at that early hour.
There is no wind. We know this because Wordsworth emphasizes the stillness and calm of the scene. He even says the waters of the Thames flow of their own accord:
The river glideth at his own sweet will
We can picture complete stillness, almost as if we are looking at a painting. It is a moment of pause before the city awakens and starts its enormous bustle and activity.
Since Wordsworth gains such solace from the quiet and serenity of the natural world, it is no wonder this would be his favorite time of day as he experiences the city. At dawn, London seems to be infused with a divine repose. The exclamation point in this statement emphasizes the emotion that he feels:
Ne'er saw I, never felt, a calm so deep!
These are words of great praise, given how much more Wordsworth preferred the natural environs of the Lake District in the north of England.
It is interesting to think about the role of absence in a poem. The absence of wind is crucial to the mood of peace that the poem conveys.