Final answer:
The paragraph sets a tense and foreboding mood through descriptions of silence, weather conditions, and a character's struggle with the elements.
Step-by-step explanation:
The mood in the paragraph described can be characterized as tense and somewhat foreboding. Phrases like "imaginary line" and "drove in silence", along with the description of windshield wipers "stuck, solid, to the glass, shuddering lightly in their icy casing", contribute to a sense of isolation and difficulty. Additionally, the weather conditions depicted by "Bits of hail stung his uncovered face" and the action of the character having to "assault the front of the car" with a scraper evoke feelings of struggle and discomfort. This combination of elements creates an overall mood that is uneasy and strained.