A warmer world
NASA's global temperature index, compared with the 1951–1980 average.
The annual global temperature anomaly compares each year with the 1951–1980 average. It is a departure from that baseline, not an absolute temperature.
Global temperature has risen since the late nineteenth century
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Source: NASA GISS GISTEMP v4, annual land–ocean temperature index, downloaded 9 November 2026. Credit: NASA GISS GISTEMP Team.
Read the baseline correctly
Zero means the 1951–1980 average. A value of 1 means one degree Celsius above that baseline. It does not mean an absolute temperature of one degree. This is an annual global index; individual places and months differ. The frozen CSV ends in 2025, so it does not mix an incomplete current year with completed annual means.