The first calendar year above 1.5 °C above pre-industrial

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The World Meteorological Organization's consolidated analysis of the major global temperature datasets reports 2024 as the warmest year in the instrumental record and the first calendar year with a global mean surface temperature more than one and a half degrees Celsius above the 1850–1900 baseline, at approximately one and a half to one and six-tenths degrees depending on dataset. The distinction that matters and is routinely lost: a single year above one and a half degrees is not a breach of the Paris temperature goal, which is expressed in terms of long-term average warming, and an exceptionally strong El Niño contributed to the 2024 figure. It is nevertheless the first time the number has been reached, and it was reached roughly a decade after the agreement that named it.

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