grass minimum

grass minimum

[′gras ′min·ə·məm]
(meteorology)
The minimum temperature shown by a minimum thermometer exposed in an open situation with its bulb on the level of the tops of the grass blades of short turf.
References in periodicals archive ?
For gardening purposes, it is important to record the temperature at ground level and most weather stations set at least two thermometers to record these with a grass minimum thermometer set in contact with short grass.
5C one night during the summer - its lowest grass minimum temperature since 1965.