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Definitions (14)
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air temperature
is measured by a sensor mounted in a radiation shield. Standard exposure is in an open grass covered area, 1.2m (4ft) above ground. AWS
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humidity
, or more accurately Relative Humidity is a percentage of the amount of water vapour the air could hold if it were totally saturated. Generally humidity is above 70% with the annual average about 84% [..]
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dewpoint
is the temperature to which air must be cooled for saturation (100% relative humidity
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windspeed
is measured by an anemometer mounted 10m (33ft) high on top of a pole. Standard mean speed is a 10 minute average. Gusts are often about 1.7 times the mean speed. A gale is a mean speed of 39mph (34Kn [..]
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wind chill
takes into account how the speed of the wind affects our perception of the air temperature
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solar radiation
is technically known as Global Solar Radiation, a measure of the intensity of the sun’s radiation reaching a horizontal surface. This irradiance includes both the direct component from the su [..]
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uv index
measures the intensity of UV. It was first defined by Environment Canada and since has been adopted by the World Meteorological Organization. UV Index uses a scale of 0 to 16 to rate the current inten [..]
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rainfall
is a measure of the amount of precipitation and is usually given in mm or inches. Precipitation would include hail, snow and dew and frost. Because of the latter 2, 'rainfall' can be recorde [..]
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rain rate
is calculated by measuring the time between tips. It is a spot rate as opposed to the rainfall during previous hour.
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