Ground frost

ground frost

1. In British usage, a freezing condition injurious to vegetation, which is considered to have occurred when a minimum thermometer exposed to the sky at a point just above a grass surface records a temperature (grass temperature) of -0.9°C (30.4°F) or below.

   
   

   Since 1961 in Britain the statistics refer to the "number of days with grass minimum temperature below 0°C" rather than to ground frost. A fuller discussion is given in McIntosh (1963).
   See frost.

   
   
2. 
   See frozen ground.

   
   
   McIntosh, D. H. 1963. The Meteorological Glossary. Her Majesty's Stationery Office, London, . p. 12.