subfreezing

English

From sub- +‎ freezing.

subfreezing (not comparable)

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.
- 1959, Steam's Finest Hour, edited by David P. Morgan, Kalmbach Publishing Co., page 20 (photo caption):
  A subfreezing December 1955 wind blows whistle steam past cab as J-5a 5439 with the Queen City yells for a Dayton (O.) crossing.