Answer:
A Stevenson Screen should be placed in an open area for two reasons:
1. To ensure that the temperature readings are accurate. If the Stevenson Screen is placed in an area that is not open, the temperature readings may be affected by the surrounding environment, such as buildings or trees.
2. To ensure that the Stevenson Screen is well-ventilated. If the Stevenson Screen is not well-ventilated, the temperature readings may be affected by the heat generated by the instruments inside the screen.
I hope this helps!