The "cold wind" and "quickened pace" in the passage suggest a mood of unease or tension. The biting cold can be interpreted as a physical manifestation of Anna's emotional state, perhaps indicating her discomfort or anxiety about her surroundings. The mention of her tightening her scarf suggests a desire for comfort and protection against the harshness of her environment, further emphasizing her vulnerability.
Her "quickened pace" reflects a sense of urgency or apprehension, implying that she feels a need to move faster, possibly to escape an unsettling feeling or to reach the safety of home. Despite the clear sky, which typically signifies calmness and safety, her perception that "something was wrong" introduces a theme of dissonance—contrasting the external environment with her internal emotional experience. Overall, these elements together create a mood that is tense and foreboding, indicating that Anna is grappling with an unknown fear or anxiety as she walks home.