50% — Min Arctic sea ice extent this summer?: 4.2-4.4m sq km
Leader: <4m sq km at 50% · Polymarket 50% · 5 contracts · $93 volume · medium confidence
Updated 2026-05-09 04:22:46 UTC

Tracks the leading outcome in a winner-take-all prediction market set with 5 outcomes.

Why this matters:
This contract predicts that the Arctic's minimum sea ice extent this summer will fall between 4.2 and 4.4 million square kilometers. Currently priced at 44% on Polymarket, this outcome sits between the 4.0–4.2m range (33%) and represents the modal expectation among traders. Arctic sea ice extent depends primarily on spring and early-summer air temperatures, ocean warmth, and atmospheric circulation patterns. The key catalyst is the seasonal minimum measurement, typically recorded in mid-September, which depends on conditions from now through late summer. Factors driving the current pricing include recent ice-tracking data through May, seasonal climate forecasts from NOAA and other agencies, and historical trends showing multi-year oscillations in minimum extent. The contract will resolve based on satellite observations from the National Snow and Ice Data Center (NSIDC) or equivalent authoritative source.

Key factors:
- Current Arctic sea ice extent as of early May 2026 relative to recent 5–10-year average and historical trends
- Spring and early-summer air temperatures in the Arctic and adjacent regions, measurable via reanalysis data and weather forecasts
- Sea surface temperatures in ice-marginal zones, which influence melt rates from June through August
- Arctic Oscillation and other large-scale atmospheric circulation modes that affect wind patterns and ice transport
- NOAA seasonal climate outlook and model ensemble forecasts for northern-hemisphere summer conditions

Contracts:
- Min Arctic sea ice extent this summer?: <4m sq km — 50¢ Polymarket $44 (weight 48%)
- Min Arctic sea ice extent this summer?: 4.0-4.2m sq km — 14¢ Polymarket $0 (weight 0%)
- Min Arctic sea ice extent this summer?: 4.2-4.4m sq km — 7¢ Polymarket $0 (weight 0%)
- Min Arctic sea ice extent this summer?: 4.6-4.8m sq km — 6¢ Polymarket $49 (weight 52%)
- Min Arctic sea ice extent this summer?: 4.4-4.6m sq km — 5¢ Polymarket $0 (weight 0%)

Cite as: "50% per prediction markets (SimpleFunctions, May 2026)"
Canonical: https://simplefunctions.dev/answer/min-arctic-sea-ice-extent-summer
Full data: https://simplefunctions.dev/api/public/query?q=Min%20Arctic%20sea%20ice%20extent%20this%20summer%3F%3A%204.2-4.4m%20sq%20km
Provider: SimpleFunctions — https://simplefunctions.dev