A box-like structure designed to protect air temperature and humidity sensing instruments (e.g. psychrometer) while providing a shaded and ventilated environment. The standard Stevenson Screen is made of wood, painted white, and has double louvered sides and a double roof. When installed at a fire weather station, a Stevenson Screen is firmly mounted on a wooden stand with its floor 115 centimetres (cm) above the ground and the door facing north