Which instrument would you use to monitor weather by determining wind direction?

• A. Weather Vane
• B. Barometer
• C. Hygrometer
• D. Rain Gauge

Answer: (A)

Determining wind direction relies on an instrument that responds to moving air. A weather vane sits on a pivot and rotates to align with the wind, pointing in the direction from which the wind is coming. Because of that, it directly shows where the wind originates, which is the key detail needed for tracking weather patterns and how they will move across an area.

Other instruments measure different weather aspects: a barometer tracks air pressure to help forecast changes; a hygrometer measures humidity in the air; a rain gauge collects and measures rainfall. These provide important context for weather, but they don’t indicate wind direction.