Will global temperature increase by between 1.20ºC and 1.24ºC in May 2026?

This ultra-narrow temperature band for a single month is priced at deep uncertainty, reflecting both the inherent difficulty of predicting precise climate outcomes and the specificity required to win this bet. With roughly 18 months until expiry, the market is currently pricing in an extremely low probability that May 2026 global temperatures will fall within this 0.04°C window, which matters because it reveals how traders view climate volatility and measurement precision at the seasonal scale.

Current Odds

Platform	Yes	No	Volume	Trade
Polymarket	3.5%	96.5%	$10K	Trade on Polymarket

Market Analysis

The bull case for YES rests on recent warming trajectory data: global temperatures have been climbing roughly 0.18°C per decade, and if this linear trend continues with typical seasonal variation, May 2026 could plausibly land in the 1.20-1.24°C range relative to pre-industrial baselines. Additionally, May typically sees specific atmospheric dynamics (reduced solar forcing variability, predictable seasonal patterns) that might cluster outcomes more tightly than other months. The El Niño Southern Oscillation (ENSO) phase entering 2026 will matter significantly—a neutral or cooling phase could suppress temperatures toward the lower end of long-term projections, improving odds for this narrow band. Historical May data from NASA GISS and Berkeley Earth would be the baseline for comparison.

The bear case dominates current pricing because hitting such a narrow 0.04°C target is statistically improbable. Climate data includes measurement uncertainty of ±0.05-0.10°C depending on methodology, which alone makes this band extremely difficult to achieve. ENSO volatility could push 2026 substantially warmer (if El Niño re-emerges) or cooler (if La Niña develops), and volcanic activity or aerosol forcing remain unpredictable wild cards. The actual observed global anomaly in May 2026 could easily overshoot into 1.25°C+ territory or fall below 1.20°C, both of which would resolve this market as NO.

Traders should closely monitor NOAA and Met Office seasonal forecasts released in early 2026, which typically come out 3-4 months before the target period. The final temperature reading will come from standard reporting agencies (likely released by July 2026), using methodologies from NOAA, NASA, or Berkeley Earth—watch for any measurement revisions that could retroactively alter the May figure. ENSO indices from late 2025 through early 2026 will be critical leading indicators worth tracking now.

Frequently Asked Questions

Which temperature dataset will determine the outcome—NOAA, NASA, or Berkeley Earth?

The market terms should specify, but most climate prediction markets default to NOAA’s Global Monitoring Lab data or NASA GISS; you need to verify the exact resolution criteria in the market fine print, as different methods can produce 0.05-0.10°C variations.

Why is a 0.04°C band so much harder to hit than, say, “between 1.15°C and 1.35°C”?

Measurement uncertainty itself is typically ±0.05-0.10°C, so this band is narrower than or comparable to the instrument precision; you’re essentially betting that random noise lands in a specific slice, making probability inversely proportional to band width.

If May 2026 ends up at 1.25°C, does the market resolve NO?

Yes—any temperature outside the 1.20-1.24°C range resolves as NO, so even a 0.01°C overshoot loses the bet for YES holders.

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