By a Rain Gauge Millimetres (mm.) Temperature How hot or cold it is By Thermometers, found inside a Stevenson Screen Degrees celsius ( c) Wind Speed How fast the wind is blowing By an Anemometer Knots, or by the Beaufort Scale Wind Direction Where the wind is blowing from By a Wind Vane Points of the compass (north, north-west etc), or bearing in degrees Element Description How it is measured Units of measurement Humidity The amount of water vapour in the air By a Hygrometer (wet and Dry Bulb Thermometers) Relative Humidity (% of water vapour that can be held by the air at the actual temperature) Air Pressure The "weight" of the air pushing on the surface of the Earth By a Barometer Hectopascals (although most people know it as millibars) Cloud Cover The amount of cloud in the sky It is observed by a meteorologist Oktas - eighths of the sky Visibility How far you can see It is observed by a meteorologist Kilometres Sunshine The hours of sunshine By a Sunshine Recorder Hours and minutes Element Description How it is measured Units of measurement
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