An open Stevenson screen showing the instruments it houses. Image by Hubhomedesign.
ZIMSEC O Level Geography Notes: Stevenson Screen
A Stevenson screen is a prominent feature on most weather stations.
- It is used to house weather instruments, for example the six’s thermometer and hydrometer.
- 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 free circulation of air.
- It has a double roof to reduce excessive heat from solar irradiation.
- It is made of wood to reduce excessive heat.
- It has metal legs to avoid attacks by termites. Sometimes the legs are made of treated wood for the same reason.
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