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What instruments are kept inside a Stevenson screen?
It forms part of a standard weather station and holds instruments that may include thermometers (ordinary, maximum/minimum), a hygrometer, a psychrometer, a dewcell, a barometer, and a thermograph.
What instruments are kept in a Stevenson screen and why?
A barometer can be found in a Stevenson screen. This instrument measures air presure. A maximum and minimum thermometer can also be found in a Stevenson screen. They measure highest and lowest temperatures.
Why is a barometer kept in a Stevenson screen?
To measure temperature at official stations, thermometers are kept in white screens, known as a Stevenson screens, designed to reflect the sunlight away and allow for ventilation, with the purpose of preventing sunshine from warming up the instruments. Pressure can be measured using a barometer mounted to the wall.
What is the best site for a weather station?
Siting Your Home Weather Station For best results, find an unobstructed area in your lawn and secure the sensor between four and seven feet above the ground. This height is the sweet spot for temperature and rain gauge, though it’s well below the recommended 32.8 feet for an anemometer.
How is Stevenson screen useful?
They protect the temperature sensors from being influenced by direct or reflected sunlight. Stevenson screens are always painted white to better reflect the sun’s rays. The louvered sides allow outside air to flow around the thermometers.
Where should a Stevenson screen be?
Stevenson screens are always installed so that the door opens facing north, to keep the sun from shining directly on the thermometers and affecting the readings.
Why is rain gauge placed below the ground?
The purpose of the grid is to reduce wind turbulence around the gauge and rain splash into the gauge. In high rainfall and poor drainage areas some arrangement has to be made to prevent the pit from flooding during heavy rain or snow melt as this could cause damage to the electronics of the gauge.