It is measured in milimetres or litre of water over 1 square metre.
Barometer.
Thermometer
Anemometer
Hygrometer
A piece of equipment used to measure humidity (= how much water there is in the air)
A piece of equipment that shows how hot or cold something is and it is expressed in celsius or fahrenheit degrees.
A device that measures air pressure and shows when the weather is likely to change
Rainfall
An instrument for measuring the speed of wind
