Science · yes no
Will 2027 be the warmest year in the Copernicus ERA5 record?
Will calendar year 2027 have a higher global average surface-air temperature than every earlier calendar year in the Copernicus ERA5 record?
The forecast uses the global annual temperature series from the ERA5 climate reanalysis.
How the result is decided
YES if the final published 2027 annual global-mean surface-air-temperature value in the Copernicus/ECMWF ERA5 record is strictly higher than every earlier calendar-year value in that record. A tie for the highest value resolves NO. Use the latest official annual data available by 31 March 2028.
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