2018 Was Fourth Hottest Year On Record — NOAA/NASA

  • 2018 Was Fourth Hottest Year On Record — NOAA/NASA

2018 Was Fourth Hottest Year On Record — NOAA/NASA

Last December was the second-warmest December in the 139 years that records have been kept.

If it seems like you've heard this before, you have: Eighteen of the hottest 19 years have occurred since 2001.

NOAA said the average temperature for the contiguous U.S.in 2018 was 53.5 degrees Fahrenheit, making it a warmer-than-average year for the 22nd year in a row.

The past five years have been the warmest in the modern record, the report said, and 2018's global temperatures were 1.5 degrees Fahrenheit, or 0.83 degrees Celsius, above the mean temperatures for 1951-1980.

In separate analyses of global temperatures, scientists from NASA, the United Kingdom Met Office and the World Meteorological Organizationoffsite link also reached the same heat ranking. "The global average temperature between now and 2023 is predicted to remain high, potentially making the decade from 2014 the warmest in more than 150 years of records".

NOAA and NASA discussed 2018's global temperature and climate in a joint news conference Wednesday; both agencies maintain independent data that goes back to 1880 to monitor temperatures around the globe.