It is kept 1.25m/4.1ft (UK standard) above the ground by legs to avoid strong temperature gradients at ground level, has louvred sides to encourage the free passage of air, and is painted white to reflect heat radiation, since what is measured is the temperature of the air in the shade, not of the sunshine.
Credit to Google.
Weather observations
because it cant get nocked over by animals
he invented the instrument
thermometer
Bold Italic undrline
allows air to reach the thermometer so that it s temprature can be measured
to protect the instruments inside from the wind!
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because it is
it is placed in the Stevenson Screen to shelter it from direct sunlight
it is placed on a big area of grass without anything affecting the themometer
To measure a more realistic temperature 🌡️
The ground, like tarmac or concrete is a solid state which absorb sunlight due to the dark colour (e.g. black). Therefore there is probability that the Stevenson Screen can absorb these heat which can then alter the readings of the instruments. Hope that helps JL
Far away from buildings, but the the door of the stevenson screen should face south so that the sun rays should not fall on the instruments
In the 1860s. I think. By Thomas Stevenson.
In the 1860s. I think. By Thomas Stevenson.
he invented the instrument
Assuming that you mean temperature (and not temputure - whatever that may be), it is measured using a thermometer which is placed at a height of 1.25 to 2 metres above ground level in a well-ventilated, white box called a Stevenson screen. A Stevenson screen will usually also contain other meteorological instruments to measure humidity, dew point and air pressure.Details for the setup are defined by the World Meteorological Organization (WMO).Incidentally, the box is named after a British Civil Engineer, Thomas Stevenson, who was father of the author, Robert Louis Stevenson.
The sides of a Stevenson Screen are louvered to allow air to circulate through the Stevenson's Screen easily.