A Stevenson screen or instrument shelter is a shelter or an enclosure to shield meteorological instrument against precipitation, and direct heat radiation from outside sources, while still allowing air to circulate freely around them.
A Stevenson screen is a prominent feature on most weather stations. It is used to house weather instruments, for example, the six’s thermometer, hygrometer, barometer, thermograph, and hydrometer.
The following are some of the prominent features of the Stevenson screen.
- It is painted white in order to reflect excessive heat.
- It is 1.2 meters above the ground to avoid ground weather conditions from affecting the readings yielded by the housed instruments.
- It has louvered sides to allow for the free circulation of air.
- It has a double roof to reduce excessive heat from solar irradiation.
- It has metal legs to avoid attacks by termites. Sometimes the legs are made of treated wood for the same reason.