Vitals
Running indicators of the planet's state, refreshed from their sources. Every past year is a faint line, the baseline mean is the dark line, this year is the accent. Where a feed marks recent days preliminary, they are dashed. Each chart names its source, licence and fetch date.
Niño 3.4 sea surface temperature
29.537 °C · 2026-09-05 · +2.795 °C vs 1991-2020
preliminary 2026-09-20: 29.731 °C, +3.037 vs baseline
1981–2026 · baseline 1991-2020 · Climate Reanalyzer, NOAA OISST v2.1, Niño 3.4 region (5°S–5°N, 170°W–120°W) · data · CC BY 4.0 · fetched 2026-09-22· The last two weeks of OISST are preliminary and revised.
Global sea surface temperature, 60°S–60°N
21.17 °C · 2026-09-05 · +0.77 °C vs 1991-2020
preliminary 2026-09-20: 21.132 °C, +0.81 vs baseline
1981–2026 · baseline 1991-2020 · Climate Reanalyzer, NOAA OISST v2.1, world 60°S–60°N · data · CC BY 4.0 · fetched 2026-09-22· The last two weeks of OISST are preliminary and revised.
Global 2 m air temperature
16.261 °C · 2026-09-15 · +0.786 °C vs 1991-2020
1940–2026 · baseline 1991-2020 · Climate Reanalyzer, ECMWF ERA5 reanalysis, global mean 2 m temperature · data · CC BY 4.0 · fetched 2026-09-22· ERA5 runs about five days behind real time.
Atmospheric CO₂ at Mauna Loa
425.91 ppm · 2026-09-13 · +47.02 ppm vs 1991-2020
1974–2026 · baseline 1991-2020 · NOAA Global Monitoring Laboratory, weekly mean, Mauna Loa Observatory · data · US public domain · fetched 2026-09-22· Weekly means; the baseline is the 1991–2020 mean for the same week.
Arctic sea ice extent
4.709 million km² · 2026-09-20 · -0.815 million km² vs 1991-2020
1978–2026 · baseline 1991-2020 · NSIDC Sea Ice Index, Version 4 (G02135), daily extent · data · NSIDC data are freely available; cite the Sea Ice Index · fetched 2026-09-22· Before 1988 the record is every other day; the baseline is the 1991–2020 mean per day of year.
Antarctic sea ice extent
17.386 million km² · 2026-09-20 · -1.301 million km² vs 1991-2020
1978–2026 · baseline 1991-2020 · NSIDC Sea Ice Index, Version 4 (G02135), daily extent · data · NSIDC data are freely available; cite the Sea Ice Index · fetched 2026-09-22· Before 1988 the record is every other day; the baseline is the 1991–2020 mean per day of year.
Citations: Climate Reanalyzer (n.d.). Daily Sea Surface Temperature / 2m Air Temperature. Climate Change Institute, University of Maine. Retrieved 2026-09-22, from https://climatereanalyzer.org/ · 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/ · NSIDC Sea Ice Index, Version 4 (G02135), National Snow and Ice Data Center; authors and DOI to be taken from the NSIDC landing page, not yet read