2023 has replaced 2016 as the warmest calendar year on record.

In 2023, close to 50% of days were more than 1.5°C warmer than the 1850-1900 level.
January 9, 2024

The year-to-year increase in global-average temperature was exceptionally large from 2022 to 2023.


Read directly from the source, report and summary available at:

Key Messages

  •  2023 is confirmed as the warmest calendar year in global temperature data records going back to 1850
  • 2023 had a global-average temperature of 14.98°C, 0.17°C higher than the previous highest annual value in 2016
  • 2023 was 0.60°C warmer than the 1991-2020 average and 1.48°C warmer than the 1850-1900 pre-industrial level
  • It is likely that a 12-month period ending in January or February 2024 will exceed 1.5°C above the pre-industrial level
  • Each month from June to December in 2023 was warmer than the corresponding month in any previous year
  • July and August 2023 were the warmest two months on record. Boreal summer (June-August) was also the warmest season on record 
  • In September 2023, the temperature deviation above the 1991–2020 average was larger than in any month in any year in the ERA5 dataset (0.93°C higher than the 1991-2020 average)
  • October, November and December 2023, each with a temperature of 0.85°C above average, ranked all joint second-largest in terms of temperature deviation above the 1991–2020 average 

Was the unusual warmth of 2023 expected?

Yes and no. Yes, in the sense that a year as warm as 2023 was seen as being inevitable in due course due to a combination of continued climate warming and an occurrence of El Niño.

See summary coverage from over 200 news sources in the Ground.News Roundup:

EU’s Copernicus scientists hold a news conference on Tuesday 9 January to discuss global climate highlights of 2023.
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