Chongqing Hit 25°C or Below on June 25, 2026 | Lines.com

Chongqing recorded a daily high of 25°C or below on June 25, 2026, resolving the Polymarket temperature market in favor of the coolest available outcome. That result landed at the opposite end of what most traders expected when the market opened. For a city where late-June highs routinely run between 27°C and 33°C, a sub-25°C ceiling on June 25 was a genuine meteorological outlier.

The market opened at 0.22, implying a 22% probability that Chongqing would stay at or under 25°C. Traders collectively assigned a 78% chance to any warmer outcome. The final price at close hit 0.999, a near-complete reversal driven by real-time temperature data arriving on June 24 and June 25. Total volume reached $44,283, with $27,663 trading in the final 24 hours alone. That late surge confirmed the outcome, not anticipated it.

What Happened on June 25 in Chongqing

Chongqing’s measured high for June 25, 2026 came in at or below 25°C, the lowest band available in this market structure. The result aligned with rain and overcast conditions typical of Chongqing’s early monsoon period, when frontal systems can suppress daily maxima well below climatological norms for late June. The resolution source confirmed the outcome through official meteorological measurement on the market’s end date of June 25, 2026.

The final price at close reflected certainty rather than anticipation. The market moved sharply upward across two sessions: a 12.5% jump and a 7.5% jump on June 24, then a further 7% on June 25 itself. Each step tracked incoming temperature readings. By close, the 0.999 price left no meaningful probability on any competing outcome.

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How the Market Priced a Cool Outlier

The opening price of 0.22 told the real story. Traders assigned just a 22% implied probability to the sub-25°C outcome at market open, consistent with historical base rates for Chongqing in late June. That framing was climatologically reasonable. Chongqing’s average June high sits near 28°C to 30°C, and the 35°C-or-higher band captures genuine heat wave risk. A sub-25°C day in the final week of June is a statistical tail event, and the market priced it as one.

The $44,283 in total volume is modest for a weather market, but the $27,663 that moved in the final 24 hours signals strong conviction once the data arrived. Liquidity of $28,555 supported clean price discovery. The market did not fail to price the outcome correctly at open. It priced exactly what climatology suggested, and the atmosphere delivered something else.

What This Outcome Means for Chongqing Climate Monitoring

Chongqing sits in a basin geography that amplifies summer heat, which is why it carries one of the most extreme urban heat profiles in China. A sub-25°C ceiling on June 25 does not contradict that profile. It reflects the variability that makes single-day temperature markets structurally different from monthly or seasonal averages. Frontal passages and heavy rainfall events can depress Chongqing’s daily maximum by 8°C to 12°C relative to surrounding days, even in peak summer. That volatility is precisely what this market was designed to capture.

For prediction markets tracking point-in-time weather outcomes, the binary or categorical structure works well when the resolution metric is unambiguous and the measurement source is authoritative. This market resolved cleanly. The harder question for future iterations is whether the opening prices on low-probability cool outcomes will adjust faster as monsoon forecasting improves. Short-range ensemble models now carry meaningful skill out to seven days for frontal timing in the Sichuan Basin.

• Chongqing’s sub-25°C result on June 25 fell within the statistical tail of late-June temperature distributions, confirming that single-day markets carry higher variance than monthly aggregates.
• Improved short-range weather modeling over the Sichuan Basin could allow traders to reprice tail temperature outcomes more quickly in future markets.
• The late-June monsoon window in Chongqing produces the highest day-to-day temperature variance of any month, making it the most information-sensitive period for point-date temperature markets.
• Similar single-day temperature markets for other basin cities in China, such as Wuhan and Nanchang, may attract higher volume as meteorological data access improves on trading platforms.

LINES RESOLUTION VERDICT

UNDERPRICED YES: COOL OUTLIER CONFIRMED

The market opened at 22% for the coolest outcome and resolved at 100%, a textbook case of a climatologically rare event that was correctly priced as unlikely until real-time data erased the uncertainty in the final 24 hours.

What the market showed: Opening implied probability of 22% versus a 99.9% final price at close versus an actual confirmed outcome of 25°C or below. The market was not wrong to price this as a tail event. It was right about the base rate and wrong about June 25 specifically.