Start with the complete chart, including its look and data.
Use this project creates one separate chart. Existing charts and AI drafts are kept. Free chart limits apply. Free exports include a watermark.
- Unit
- September sea ice extent · million km²
- Period
- 1979–2026
- Source
- NOAA/NSIDC Sea Ice Index v4, monthly September mean sea ice extent, accessed 31 October 2026. September is late summer in the Arctic and late winter in Antarctica; values are monthly averages, not daily extremes. Extent is the ocean area in grid cells with at least 15% ice concentration. Satellites and processing sources change in 2025. Animation interpolates between annual September observations.
- License
- Fetterer et al. (2025), Sea Ice Index, Version 4, NSIDC. NASA Earth Observatory / NSIDC maps show daily 2026 extrema; Antarctic sea ice background photograph by NASA/Jeremy Harbeck, October 2018, illustrative iceberg. No endorsement implied.