An open Stevenson screen showing the instruments it houses. Image by Hubhomedesign.

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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