temperature, how hot or cold the air is, measured with a thermometer, expressed in degrees celsius, precipitation, how much rain, snow, hail or frost there is.collected in a rain gauge, expressed in millimetres, wind direction, direstion from which the wind is blowing.a wind vane shows the compass directions, wind speed, how fast the wind is blowing.an anemometer shows wind speed in knots, air pressure, how greatly the atmosphere is pressing on the earth's surface. measured with a barometer in barometer in hectopascals, humidity, how much water vapour there is in the air.a hygrometer will measure the relative humidity of the air -how much water vapour it contains as a percenrage of what it could contain, cloud cover, what fraction of the sky is cloudy.we judge cloudiness by eye and express it as oktas (eighths).the type and height of cloud is also noted (eg.high cirrus, low stratus)., sunshine, how many hours of sunshine are experienced Duration of sunshine is measured on a sunshine recorder

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