The Copernicus Climate Change Service said in a June 10 bulletin that May was
the second-warmest May on record. Global mean surface temperature for May was
15.81 C, 0.55 C above the 1991–2020 average and 1.42 C above pre-industrial
levels, trailing only May 2024. An El Nifio expected to form in coming months
could trigger extreme weather across multiple regions.