Arctic sea ice reaches 2026 minimum extent of 4.6 million km2
Arctic sea ice fell to 4.6 million km2 in September 2026, tying the 10th‑lowest extent recorded since satellite monitoring began.
Key facts
- 2026 minimum extent was 4.6 million km2.
- The extent tied the 10th‑lowest level recorded since 1978.
- Every summer 2007‑2026 ranked among the 20 lowest September extents.
- Multiyear ice has declined, first‑year ice increased.
- March 2026 maximum tied March 2025 for the lowest winter peak.
Arctic sea ice expands in winter and retreats in summer. Satellite data since 1978 show a long‑term decline. The 2026 minimum extent was 4.6 million km2.
According to NASA and NSIDC, the 2026 extent tied the 10th‑lowest level recorded. It matches the minima of 2008, 2010, and 2025. The record shows a steady drop over the past decades.
Every summer from 2007 to 2026 ranked among the 20 lowest September extents. The smallest extent occurred in 2012. The rate of loss has slowed in the past decade.
NASA researchers note that increased cloud cover has reduced sunlight and slowed melting. Multiyear ice has declined sharply. First‑year ice, which is thinner, now dominates the Arctic.
In March 2026, the maximum extent tied the March 2025 maximum for the lowest winter peak. This indicates a shift in both summer and winter ice dynamics.
Context
The Arctic sea ice cycle depends on seasonal temperature changes. Climate patterns can change the amount of ice each year. Recent data show the ice is thinner and younger.
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