Final answer:
The comparison suggests a sense of rigidity and harshness, similar to the solid and unyielding nature of a structure made by masonry.
Step-by-step explanation:
When the poet compares the falling snow to the north wind's masonry, it suggests a sense of rigidity and harshness. Masonry, being the building of structures from individual units of stone or brick, typically requires precision, strength, and creates a solid, impenetrable barrier.
This comparison accentuates the snow's relentless and unyielding nature, much like a wall built by the north wind. The words such as “fear-frozen,” “coldness,” and “snowy” not only describe the physical attributes of the scene but also hint at an underlying emotional distance or coolness, implying a metaphorical 'wall' or barrier.