absolute

1. With respect to atmospheric motions, refers to an absolute coordinate system; for example, absolute vorticity as distinguished from relative vorticity.
2. In climatology, the highest or lowest recorded value of a meteorological element, whether at a single station or over an area, during a given period.
   It is most frequently applied to extremes of temperature: absolute maximum is the highest recorded shade temperature; absolute minimum is the lowest recorded.
3. See Kelvin temperature scale.