Air Temperature is measured in degrees Celsius by a sensor located five feet off the ground Barometric Pressure is the amount of downward force exerted by the weight of the air above and is measured in hectopascal which is equivalent to the older unit millibar (mbar).
Wind Speed is the average velocity at which the air travels over a one-minute period and is measured in miles per hour . Speed Description (mph) < 1 Calm 1-4 Light air 5-7 Light breeze 8-11 Gentle breeze 12-18 Moderate breeze 19-24 Fresh breeze 25-31 Strong breeze 32-38 Near gale 39-46 Gale Moderate 47-54 Strong gale 55-63 Storm Very hig 64-73 Violent storm˙ 74+ Hurricane Rain fallen over the last hour
Is a measure of the amount of water vapour content of the air, where 100%= the dew point, i.e the atmosphere is saturated with water and water begins to condense.
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