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

, 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% [..]

is the temperature to which air must be cooled for saturation (100% relative humidity

takes into account how the speed of the wind affects our perception of the air temperature

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 [..]

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 [..]

is the weight of the air that makes up our atmosphere exerts a pressure on the surface of the earth. This pressure is known as atmospheric pressure. Generally, the more air above an area, the higher t [..]

is measured by sensors placed in contact with the tips of short grass, about 5cm (2") above ground. This is measured by the AWS with an electronic probe. A standard Min thermometer placed on [..]

is short for Automatic Weather Station