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- 2023 is confirmed as the warmest calendar year in global temperature data records going back to 1850.
- It is likely that a 12-month period ending in January or February 2024 will exceed 1.5°C above the pre-industrial level.
- 2023 marks the first time on record that every day within a year has exceeded 1°C above the 1850-1900 pre-industrial level. Close to 50% of days were more than 1.5°C warmer then the 1850-1900 level, and two days in November were, for the first time, more than 2°C warmer.
- Global average sea surface temperatures (SSTs) remained persistently and unusually high, reaching record levels for the time of year from April through December.
- The atmospheric concentrations of carbon dioxide and methane continued to increase and reached record levels in 2023, reaching 419 ppm and 1902 ppb respectively. Carbon dioxide concentrations in 2023 were 2.4 ppm higher than in 2022 and methane concentrations increased by 11 ppb.
