subfreezing
adjEtymology From sub- + freezing.
1
Colder than the freezing point of water; below zero degrees Celsius or 32 degrees Fahrenheit.
- The arctic cold front brought subfreezing temperatures, snow, freezing rain and treacherous driving conditions.
- A subfreezing December 1955 wind blows whistle steam past cab as J-5a 5439 with the Queen City yells for a Dayton (O.) crossing.1959, Steam's Finest Hour, edited by David P. Morgan, Kalmbach Publishing Co., page 20 (photo caption)