Which statement correctly pairs a weather phenomenon with its measurement method?

Which statement correctly pairs a weather phenomenon with its measurement method?

• A. Cloud cover is measured with the Oktas scale
• B. Wind direction is measured with the Campbell Stokes recorder
• C. Sunshine duration is measured with the Beaufort scale
• D. Humidity is measured with the Oktas scale

Answer: (A)

Cloud cover is measured with the Oktas scale, which estimates how many eighths of the sky are covered by clouds, from 0 (clear) to 8 (overcast). This visual method directly quantifies cloudiness. The Campbell-Stokes recorder is used to record sunshine duration, not wind direction. The Beaufort scale measures wind speed (wind force), not sunshine duration. Humidity is determined with instruments like a psychrometer or hygrometer, not the Oktas scale. So pairing cloud cover with the Oktas scale is the correct match.

Cloud cover is measured with the Oktas scale, which estimates how many eighths of the sky are covered by clouds, from 0 (clear) to 8 (overcast). This visual method directly quantifies cloudiness. The Campbell-Stokes recorder is used to record sunshine duration, not wind direction. The Beaufort scale measures wind speed (wind force), not sunshine duration. Humidity is determined with instruments like a psychrometer or hygrometer, not the Oktas scale. So pairing cloud cover with the Oktas scale is the correct match.