The month blew away the previous record September by an unheard of magnitude.
Share on email Following the hottest June through August on record, and the globe's hottest ever month in July, last month's preliminary data has astonished climate researchers who anticipated such extremes eventually.
The figures show a temperature anomaly of about 0.9°C above the 1991-2020 average. Converted to the preindustrial era, this amounts to a departure from average of 1.7°C , temporarily exceeding the, September 2023 beat the previous warmest September by 0.5°C . Typically, monthly records are beaten by fractions of a degree, with such narrow margins that different climate centers around the world can rank them differently.
"We've never seen a record smashed by anything close to this margin," climate scientist Zeke Hausfather told Axios. "It's frankly a bit scary."The data comes from computer modeling systems that use separate, well-tested methods to estimate the planet's weather and climate conditions during the previous month.
Data from three different reanalyses show that the planet spiked a far hotter fever in September, all but ensuring that 2023 will be the warmest year on the books.The extreme heat this summer and fall is the result of a combination of factors, starting with long-term, human-caused climate change. In addition, anYet global oceans are setting warming records for a variety of natural and human-caused reasons, sending global temperatures even higher.
, so "The harm caused by each additional tenth of a degree of warming is much larger than the harm caused by the previous tenth of a degree."Additional monthly data, including some stemming from global surface observations, will come out from the Copernicus Climate Change Service, NASA and NOAA during the next two weeks; however, the September temperature rankings are not expected to be different.
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