In my DIYDIY Do It Yourself Global Temperature series I can now reveal the worst kept secret of 2023 has finally proven to be correct in that 2023 has finally overtaken 2016 to become the warmest calendar year on record. I make the mean temperature in 2023 to be 10.21°C, which is 0.36°C above the 1991-2020 LTALTA Long Term Average. This is usually defined as a 30 year period by the WMO.. That makes it fractionally warmer than the 10.16°C of 2016, the previous warmest year. The last seven months of 2023 all set new records so the fact that it would be the warmest year was a bit of an inevitability. The latest 30 year annual linear trend shows a warming of 0.15°C/decade.