Will the minimum Arctic sea ice extent this summer be between 4.0m & 4.2m square kilometers?

Analysis

The coherent ensemble core (15–20%) and the market (17.4%) both converge on the well-supported base rate for hitting a narrow 0.2M km² bin given ~±0.4M km² July-lead uncertainty and a central forecast (4.49) sitting just above the bin. The gap between trimmed mean (14%) and market (17.4%) is under the 5% threshold, the sibling market ladder is internally consistent, and there are no factual disputes a lookup could settle. I set my final probability at 16%, slightly above the trimmed mean to correct for the two artifact-driven low outliers, but this is a clear SKIP: no exploitable edge on either side.

Key Evidence

NIPR May 2026 thickness-based forecast of 4.49M km² minimum (above the bin); recent minima cluster 4.23–4.72 (2021–2025); only ~2–3 of the last ~19 years hit the narrow 0.2M km² bin (~15% base rate); July-lead forecast uncertainty (~±0.4M km²) is twice the bin width; 2026 tracking low but similar to 2025 which finished at 4.60.

Risks

It is resolution day and a hypothetical NO trade lost because a persistent Arctic dipole/warm August accelerated melt from the already-low starting point (record-low max, top-6 June), landing the minimum squarely in the 4.0–4.2 bin as in 2016/2019 — exactly the ~1-in-6 scenario the ensemble priced in.

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