F.4 IGCSE Geography Weather Instruments

What is shown in the photo?

• Thermometer

• Stevenson Screen

• Sunshine Recorder

• Barometer

What is the main purpose of a Stevenson Screen?

• To measure wind speed

• To shelter meteorological instruments from direct sunlight and precipitation

• To collect rainfall

• To measure atmospheric pressure

This instrument measures the amount of rainfall over a specific period.

• Rain gauge

• Maximum-minimum thermometer

• Wet-and-dry bulb thermometer

• Anemometer

This instrument measures the duration of sunlight at a particular location.

• Wind vane

• Barometer

• Sunshine recorder

• Rain gauge

This instrument measures atmospheric pressure.

• Wet-and-Dry Bulb Thermometer (Hygrometer)

• Barometer

• Anemometer

• Stevenson Screen

This device measures humidity in the air.

• Wet-and-Dry Bulb Thermometer (Hygrometer)

• Sunshine Recorder

• Rain Gauge

• Anemometer

A maximum-minimum thermometer measures...

• The humidity in the air

• The duration of sunlight at a particular location.

• The highest and lowest temperatures recorded over a period.

• Wind speed and sometimes wind direction.

An ​ (a)   measures wind speed while a ​ (b)   indicates the direction of the wind.

• Wind direction
• anemometer
• wind vane
• barometer
• thermometer

How is the Stevenson Screen used?

• Read and note the temperature and humidity at regular intervals.

• Allow time for the instruments to acclimate to the surrounding air temperature.

• Place the Stevenson Screen in an open area away from buildings and trees.

• Place thermometers and hygrometers inside the screen.

How is the rain gauge used?

• Position the rain gauge in an open area, ideally on level ground.

• Ensure the gauge is empty before rainfall.

• After a rainfall event, check the water level in the gauge.

• Note the depth of water collected, usually measured in millimeters.