Last updated October 10, 2018

Winter in North America Is Cold — Dec. 2017-Jan. 2018

  • The two-week cold outbreak in the northeastern U.S. and southeastern Canada was highly unusual in the current climate; however, it is not unprecedented.
  • Cold waves like this have decreased in intensity and frequency over the last century, but still occur.
  • Temperatures like these are now about fifteen times rarer. This is equivalent to cold waves being about 4ºF (2ºC) warmer than they used to be.