Dictionary.com
Thesaurus.com

subzero

British  
/ sʌbˈzɪərəʊ /

adjective

  1. (esp of temperature) lower or less than zero

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The city is expected to be hit particularly hard with 18-24 inches of snow expected to fall in the metro area and temperatures dropping into the 20s F and subzero C.

From BBC

For those of us in the greater Northeast, frigid temperatures, subzero wind chills and high piles of snow that have now turned into thick blocks of ice remain relentless.

From Salon

This time of year, they work mostly under dark skies amid high winds and subzero temperatures.

From The Wall Street Journal

Protests erupted after the shootings despite subzero temperatures.

From The Wall Street Journal

Hundreds of protesters stood outside in subzero temperatures and made as much noise as possible—banging pots, blowing whistles, drumming on buckets, blowing trombones and trumpets.

From Slate