Will Mexico City's temperature on May 18 stay at 17°C or below? Current odds at 1% reflect extreme unlikelihood of such a cold event in late spring.
This market has been archived. Historical content preserved below.
Mexico City sits at 2,250 meters elevation in a subtropical highland climate, where May typically sees high temperatures between 26–28°C. A maximum of 17°C or below would represent an extraordinary cold event, roughly 9–11 degrees below seasonal norms. The 1% YES odds trading on this market reflect the extreme rarity of such a temperature crash in late spring. At this juncture in May, the city rarely experiences cold snaps of this magnitude; the typical weather pattern involves warming trend toward the dry season. The very low liquidity ($2,700) and minimal volume ($5 over 24 hours) suggest limited trader interest, likely because the outcome feels predetermined by climatology. Current price action implies near-certain belief that no major cold system will override Mexico City's late-spring warming trajectory by May 18.
Mexico City's climate is shaped by its high altitude, tropical latitude, and mountainous terrain. At 2,250 meters above sea level, the city experiences mild year-round temperatures compared to sea-level Mexico, with daily highs typically ranging from 24–28°C during May. The dry season begins in November and extends through May, characterized by stable high-pressure systems, clear skies, and relatively predictable diurnal temperature swings. Historical May data shows extreme low temperatures occur fewer than 1–2% of the time, usually triggered by rare transient cold fronts pushing south from the American Great Plains or unusual atmospheric disturbances. For temperatures to plunge to 17°C or below, an unusually deep and fast-moving cold system would need to penetrate Mexico's high plateaus—an event that becomes increasingly rare as spring advances toward summer. The current 1% odds suggest traders assess such a scenario as virtually impossible. Conversely, factors that could push the market toward YES include: an unexpected polar vortex displacement, a rare late-season cold air outbreak, or atmospheric blocking patterns that reverse typical May heating. Most likely NO catalysts include: seasonal warming persistence, high-altitude solar heating, and the established anticyclonic circulation typical of late spring. Traders pricing at 1% seem confident that routine May climatology will hold. For context, May 2025 saw no days below 17°C in Mexico City; the same applies to most historical Mays. The extremely tight bid-ask and minimal volume reflect this near-certainty. The spread between 1% and 99% is massive, but no liquidity exists to challenge it, suggesting strong consensus among the small group monitoring this micro-market.
The market resolves based on the official maximum temperature for May 18 recorded by Mexico's National Meteorological Service for Mexico City. YES wins if the high is 17°C or below; NO wins if it exceeds 17°C.
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.