Earth's global surface temperature in 2025 was slightly warmer than 2023 - but within the margin of error the two years are effectively tied according to an analysis by NASA scientists. Since record-keeping began in 1880, the hottest year on record remains 2024.
Global temperatures in 2025 were cooler than 2024, with average temperatures of 2.14 degrees Fahrenheit (1.19 degrees Celsius) above the 1951 to 1980 average.
The analysis from NASA's Goddard Institute for Space Studies includes air temperature data acquired by more than 25,000 meteorological stations around the world, from ship- and buoy-based instruments measuring sea surface temperature, and Antarctic research stations. The data are analyzed using methods that account for the changing distribution of temperature stations and for urban heating effects that could skew the calculations.
Additionally, independent analyses by the National Oceanic and Atmospheric Administration, Berkeley Earth, the Hadley Centre (part of the United Kingdom's weather forecasting Met Office), and Copernicus Climate Services in Europe have concluded the global surface temperature for 2025 was the third warmest on record. These scientists use much of the same temperature data in their analyses but employ different methodologies and models, which exhibit the same ongoing warming trend.
NASA's full dataset of global surface temperatures, as well as details of how agency scientists conducted the analysis are available online.
