grass minimum thermometer

grass minimum thermometer

A minimum thermometer used for measuring the lowest temperature reached during the night very near to the ground. Unlike other thermometers, this one stays outside the screen and its reading is lower than the one kept inside the screen. See also minimum thermometer and screen (iii).
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.