Vitals
Six running measurements of the planet's state, refreshed from their sources at every deploy.
Every chart is drawn the same way. Each past year is a faint line, older years fainter. The 1991–2020 mean is the dark line. This year is the coloured line, and where a feed marks its latest days preliminary they are dashed. The number above each chart is the latest reading and how far it sits from the mean for that day of the year.
A twin of a place sits inside these numbers. The idea of watching a short list of planetary vital signs follows the annual state of the climate report in BioScience, which tracks sixteen.
Each series is also published as JSON beside this page, with its source, licence, fetch date and a hash of the raw download, for anyone's model to read.
Atmospheric CO₂ at Mauna Loa
426.86 ppm · 2026-10-11 · +47.835 ppm vs 1991-2020
1974–2026 · baseline 1991-2020 · NOAA Global Monitoring Laboratory, weekly mean, Mauna Loa Observatory · data · json · US public domain · fetched 2026-10-20· Weekly means; the baseline is the 1991–2020 mean for the same week.
Global 2 m air temperature
15.398 °C · 2026-10-14 · +0.866 °C vs 1991-2020
1940–2026 · baseline 1991-2020 · Climate Reanalyzer, ECMWF ERA5 reanalysis, global mean 2 m temperature · data · json · CC BY 4.0 · fetched 2026-10-20· ERA5 runs about five days behind real time.
Global sea surface temperature, 60°S–60°N
21.081 °C · 2026-10-04 · +0.817 °C vs 1991-2020
preliminary 2026-10-19: 21.027 °C, +0.822 °C vs 1991-2020
1981–2026 · baseline 1991-2020 · Climate Reanalyzer, NOAA OISST v2.1, world 60°S–60°N · data · json · CC BY 4.0 · fetched 2026-10-20· The last two weeks of OISST are preliminary and revised.
Niño 3.4 sea surface temperature
29.949 °C · 2026-10-04 · +3.3 °C vs 1991-2020
preliminary 2026-10-19: 30.044 °C, +3.341 °C vs 1991-2020
1981–2026 · baseline 1991-2020 · Climate Reanalyzer, NOAA OISST v2.1, Niño 3.4 region (5°S–5°N, 170°W–120°W) · data · json · CC BY 4.0 · fetched 2026-10-20· The last two weeks of OISST are preliminary and revised.
Arctic sea ice extent
6.717 million km² · 2026-10-17 · -0.83 million km² vs 1991-2020
1978–2026 · baseline 1991-2020 · NSIDC Sea Ice Index, Version 4 (G02135), daily extent · data · json · Freely available; cite the Sea Ice Index · fetched 2026-10-20· Before 1988 the record is every other day; the baseline is the 1991–2020 mean per day of year.
Antarctic sea ice extent
16.204 million km² · 2026-10-17 · -2.073 million km² vs 1991-2020
1978–2026 · baseline 1991-2020 · NSIDC Sea Ice Index, Version 4 (G02135), daily extent · data · json · Freely available; cite the Sea Ice Index · fetched 2026-10-20· Before 1988 the record is every other day; the baseline is the 1991–2020 mean per day of year.
Citations: Lan, X., Tans, P. and K.W. Thoning: Trends in globally-averaged CO2 determined from NOAA Global Monitoring Laboratory measurements. https://gml.noaa.gov/ccgg/trends/ · Climate Reanalyzer (n.d.). Daily Sea Surface Temperature / 2m Air Temperature. Climate Change Institute, University of Maine. Retrieved 2026-10-20, from https://climatereanalyzer.org/ · National Snow and Ice Data Center. Sea Ice Index, Version 4 (G02135). https://doi.org/10.7265/a98x-0f50