Where should the Stevenson screen be placed to ensure accurate readings?

• A. Above the ground and away from buildings
• B. On the roof
• C. In direct sun
• D. In a basement

Answer: (A)

To get accurate readings, the Stevenson screen must be positioned so the air inside reflects the true outdoor air temperature, not heat coming from nearby surfaces. Placing it above ground level keeps it away from ground heat and moisture, and being away from buildings reduces heat radiating from walls or pavements. It should also be shaded from direct sun and have good ventilation so the air inside can mix with the surrounding air. Placing it on a roof, in direct sun, or in a basement would bias the readings. So the best placement is above the ground and away from buildings.