Thermometers, barometers, rain gauges, hygrometers, weather vanes, and anemometers are the most important meteorological instruments. Thermometers measure temperature and maximum/minimum temperatures, barometers measure atmospheric pressure, rain gauges measure rainfall, hygrometers measure humidity, weather vanes show wind direction, and anemometers measure wind speed. These instruments are used to collect data to predict weather conditions.

1. The most important
meteorological instruments

2. Thermometer
 A thermometer
measures atmospheric
temperature.
 To predict the weather
we use a maximum and
minimum thermometer.
This registers the
maximum and the
minimum temperature in
one day.

3. Barometer
 A barometer measures atmospheric pressure.

4. Rain gauge (pluviometer)
 A rain gauge or
pluviometer
measures the
amount of rainfall or
snow per square
metre.

5. Hygrometer
 A hygrometer measures atmospheric humidity
(the humidity in the air)

6. Weather vane
 A weather vane
shows the direction
of the wind.

7. Wind gauge (anemometer)
 An anemometer measures
wind speed or strength of
the wind.