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Global temperature records for individual months are maintained by agencies like NASA's Goddard Institute for Space Studies, NOAA, and the World Meteorological Organization, with May records extending back to 1850. As May 2026 nears completion, traders are assessing whether this month will rank as the hottest May on record—a historical milestone that requires surpassing prior benchmarks set during recent warming cycles. The 1% market odds reflect an overwhelming consensus that May 2026 will not achieve this distinction. This low probability suggests May 2026's temperature data to date does not track as exceptionally warm relative to recent record-holding months. Breaking a monthly temperature record is particularly difficult because a single month must overcome baseline seasonal patterns and natural climate variability driven by ocean cycles like El Niño. The prior hottest May on record was set during a strong El Niño phase in 2024, establishing a high bar for May 2026 to exceed. Resolution will occur via official NOAA and NASA data releases in early June 2026.
Global temperature records for individual months are maintained by agencies like NASA's Goddard Institute for Space Studies (GISS), NOAA's National Centers for Environmental Information, and the World Meteorological Organization. These institutions aggregate data from thousands of weather stations, satellites, and ocean buoys to calculate the global mean temperature for each month. The 'hottest May on record' would mean May 2026 had the highest average global temperature of any May since instrumental records began around 1850. This is distinct from annual records—breaking a monthly record is considerably more difficult because a single month must overcome natural weather variability, seasonal patterns, and the specific influence of ocean oscillations like El Niño and La Niña. The current market odds of just 1% reflect a strong consensus among traders that May 2026 will not achieve this distinction, an assessment that makes sense given recent climate history. May 2024 occurred during a strong El Niño phase and set or approached multiple monthly records; for May 2026 to surpass that, global temperatures would need to accelerate dramatically beyond the underlying warming trend, or a comparable or stronger El Niño would need to be in effect. However, El Niño conditions have been weakening through early 2026, and weak La Niña or neutral conditions are more likely by May, providing less thermal boost to global averages. What could push the market toward YES? An unexpected acceleration of climate warming, an unexpectedly strong El Niño resurgence in spring 2026, or natural weather patterns such as sustained tropical heat or reduced cloud cover could theoretically create a scenario where May 2026 breaks the record. What points toward NO? Prior record-holding Mays—particularly May 2024 during strong El Niño—already set high bars that would be difficult to exceed, and trending data through May 2026 appears relatively normal for a warming world but not anomalously hot. The 1% market price implies traders view this as a negligible tail event, acknowledging that while climate warming is real and consistent, breaking specific monthly records requires either that prior record to be unusually old or this month to be extraordinarily extreme. The market's confidence reflects both recent observational data and mechanistic understanding that May 2026 would need to be a statistical outlier even among an already warming climate.
Resolves YES if May 2026 is confirmed the hottest May on record by NOAA/NASA; NO otherwise. Resolves June 10, 2026.
Polymarket Trade is an independent third-party interface to the Polymarket CLOB prediction market exchange on Polygon — not affiliated with Polymarket, Inc. Prediction markets aggregate trader expectations into real-time probability estimates. 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. Polymarket Trade is non-custodial — your funds never leave your wallet. Open the full interactive page linked above to place orders, see order book depth, and execute a trade.
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