When all aloud the wind doth blow
It is a description for the loud sound of the wind, it is a sound imagery because in this line you can imagine that you are hearing the wind blows. The image is hearing.
And coughing drowns the parsons saw
The voice of the sick people in the church while they are coughing is very loud and annoying so he describes it as the sound of the saw and no one can hear the parsons talking. Here we have hearing image and metaphor.
And birds sit brooding in the snow
The birds are sitting sadly and not singing because of the snowy weather. The image is visual.
And Marian's nose looks red and row
The little girl Marian has a red and row nose because of the very cold weather and sickness. Here we have visual image and metaphor.
When roasted crabs hiss in the bowl
Heated green apples are making a hissing sound in the dish because of the cold weather. The image is hearing.
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Theme:
Poetry should not just deals exclusively with beauty like sunset, flowers, or love. The function of poetry is sometimes to be ugly rather than beautiful, and poetry may deal with common goals and grassy cooks as good as with sunset and flowers.
The poem contains no moral, no lessons, no messages like some readers wants.
The main theme in this poem is about the tough and extremely cold winter. It is descriptive poem for conditions that people went through in the cold winter in that time.