Global temperatures have risen roughly 1.1–1.3°C above pre-industrial levels in recent years, with 2024 and 2025 being among the warmest years on record. This market narrows down to a very specific range: whether April 2026's monthly temperature anomaly lands between 1.25°C and 1.29°C above the 1850–1900 baseline. At 3% odds, traders view this outcome as unlikely, suggesting they expect April to trend either higher (exceeding 1.30°C) or significantly lower. The resolution source is typically NASA's Goddard Institute for Space Studies (GISS) or NOAA's global temperature anomaly, released in early May. April weather patterns—including solar activity, El Niño status, and volcanic forcing—will shape the final reading. The narrow 0.04°C band reflects the precision climate scientists can measure, yet markets can trade such granular outcomes. Current low conviction likely means April is shaping up toward the upper or lower extremes of recent warming, not squarely in this middle-band.
Deep dive — what moves this market
Global temperature measurement has become increasingly precise over the past decades, with agencies like NASA's Goddard Institute for Space Studies, NOAA, and the Japan Meteorological Agency all producing monthly anomaly estimates relative to the 1850–1900 pre-industrial baseline. This baseline choice matters: it anchors warming discussions to a time before industrial fossil fuel combustion radically altered Earth's radiative balance. The 1.25–1.29°C band in this market represents a narrow slice of the current warming regime; recent years have clustered in the 1.10–1.35°C range depending on the month and source, with 2024 and early 2025 sitting toward the higher end. April 2026's reading will depend on a complex interplay of factors: solar irradiance cycles, stratospheric aerosol loading from volcanic eruptions, sea surface temperatures, and natural oscillations like the Atlantic Multidecadal Oscillation or Pacific Decadal Oscillation. For the market to resolve YES, April would need to produce a reading that avoids both the upward spikes seen in recent months and any unexpected cool anomaly from atmospheric conditions. The recent trend has been toward higher anomalies, with monthly readings increasingly exceeding 1.30°C throughout 2025 and early 2026. This upward trajectory suggests the likelihood of landing in a specific narrow mid-range band is lower than it would be in a more stable climate. Conversely, the 3% odds reflect trader expectations that April will either be unusually warm, continuing the spike above 1.30°C, or will see a temporary dip from seasonal conditions—both deemed more probable than hitting the 1.25–1.29°C corridor. Historically, April temperatures have shown considerable month-to-month volatility; the month has recorded readings near 1.15°C in cooler years and above 1.35°C in warming outlier years over the past half-decade. The low odds also embed skepticism about narrowly banding a chaotic system. If traders price April at only 3% chance of this narrow outcome, the consensus is that the month will diverge—either notably warmer or notably cooler—than this specific band. Seasonal forecasts and emerging April data will clarify probability substantially by late month, potentially shifting these odds sharply if forecasts suggest directional divergence. The resolution occurs after NASA GISS publishes its final April 2026 anomaly estimate, typically within the first two weeks of May.
What traders watch for
NASA GISS April 2026 data release in early May determines resolution; any subsequent revision in June could affect final settlement.
Late-April global weather patterns and Pacific sea surface temperature anomalies will determine whether readings exceed or fall below the 1.25–1.29°C band.
El Niño or La Niña conditions in April 2026 and overall ENSO phase strength will significantly influence final monthly temperature anomaly.
Stratospheric aerosol levels and volcanic forcing data from early 2026 will modify the baseline warming trajectory used in April's calculation.
How does this market resolve?
Resolution is determined by NASA GISS's final April 2026 global temperature anomaly estimate, released in early May. The market resolves YES only if the anomaly falls between 1.25°C and 1.29°C above the 1850–1900 pre-industrial baseline.
Prediction markets aggregate trader expectations into real-time probability estimates. On Polymarket Trade, every market question resolves YES or NO based on a specific event outcome; traders buy shares of the side they believe will resolve positively. Prices range 0¢ (certain no) to 100¢ (certain yes) and naturally reflect the crowd-implied probability of YES. This page summarizes the market state for readers arriving from search; for live trading (place orders, see order book depth, execute a trade) open the full interactive page linked above.
