1Below zero on the Fahrenheit scale (–18 Celsius); very cold.

1. 1.1 Below zero on the Celsius scale; below freezing.
   Example sentencesExamples

   • Keeping warm in the sub-zero temperatures of Siberia is a tough enough challenge for anyone.
   • Greek troops battled snow storms and rescued 108 train passengers stranded in sub-zero temperatures yesterday, authorities said.
   • He never once seemed cold despite the sub-zero temperatures and the icy storm that was tearing the sky down around them.
   • Mont Blanc is just 13 km from Les Droites, the peak on which Andrew doggedly clung to life for five days in sub-zero temperatures after becoming trapped in a storm.
   • But in sub-zero temperatures and blizzard conditions they had to retreat beneath canvas for the night and abandon the rescue mission.
   • The ice pad will remain frozen via an elaborate pipe system, under the rink's base, which uses a freezing solution to maintain the ice at sub-zero temperatures.
   • In very heavy seas, gales, blizzards and sub-zero temperatures and darkness six people including a girl aged 12 were rescued.
   • The national weather service have warned that sub-zero temperatures at night could result in some severe frost and icy roads for tomorrow morning.
   • The cold front, which moved in over the province last Friday, has brought with it sub-zero temperatures, snow and rain over many parts of the province.
   • Oh, how we'll laugh about this in November, when we're shivering in sub-zero temperatures and walking through freezing sleet.
   • This was the only Borders fixture that beat the heavy frost and sub-zero temperatures that forced the cancellation of every other rugby game in the region yesterday.
   • Due to the sub-zero temperatures, around minus 52C including the wind chill factor, the body burns more calories a day to maintain warmth.
   • He described his 1,200 km walk through the frozen Antarctic as a long, hard slog with biting winds and sub-zero temperatures.
   • Outside the temperatures were sub-zero and the sea was frozen over.
   • High winds and ice snapped power cables, and sub-zero temperatures and wind gusts hindered the attempts of emergency teams to reconnect them.
   • The house was still standing but quite chilly in the sub-zero temperatures.
   • It can feel relatively warm, even in sub-zero temperatures, if the sky is clear and the sun is shining, while a higher temperature can feel relatively cool if accompanied by a biting cold wind.
   • The battle was fought on a freezing cold Palm Sunday, with soldiers facing blizzards and sub-zero temperatures.
   • And he will train in a freezer at a supermarket depot to get used to sub-zero temperatures he will have to endure.
   • The school's assistant headteacher arrived back from his trip at the end of September after braving sub-zero temperatures, polar bears and rough seas.

   Synonyms

   icy, freezing, bitterly cold, glacial, sub-zero, frozen, wintry