Chengdu Hit 30°C or Higher on June 30, 2026 | Lines.com

Chengdu recorded a daily high of at least 30°C on June 30, 2026, resolving this Polymarket temperature market in favor of the primary outcome. The result aligned with late-June climatological norms for the Sichuan basin, where end-of-month highs average near 30°C and regularly push into the low 30s. The market closed fully priced at 1.00 before the measurement window ended.

Traders entered this market with the outcome priced at just 22 cents (22% implied probability) at open, then watched the price swing dramatically on June 29 before converging to full certainty by resolution. That 78-point move from open to settlement reflects a market that initially underpriced a climatologically likely event. Total volume reached $155,070, with $97,829 trading in the final 24 hours alone, signaling a late rush of conviction as the result became apparent.

Chengdu Reached the 30°C Threshold on June 30

The market’s primary outcome, a daily high of 30°C or above, triggered resolution on June 30, 2026, the market’s stated end date. Chengdu’s late-June climate consistently delivers highs in the 28-33°C range, and the final day of the month sits at the warmer end of that window historically. No exotic weather event was required. The threshold resolved on ordinary seasonal progression.

The final hours of trading told a clean convergence story. The price at close reached 1.00, up from volatile intraday levels on June 29 that saw a 23.5% drop followed by a 29% recovery and then a further 19.4% gain within the same session. Those swings reflected genuine uncertainty about whether that specific calendar day would cross the 30°C line. By resolution, the data settled the question cleanly.

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How the Market Performed on Chengdu June 30 Temperature

The market opened at 22% implied probability for a 30°C-or-higher outcome. That pricing undervalued the climatological base rate. Chengdu’s average high on June 30 sits at approximately 30°C based on multi-decade records, meaning the true probability of hitting that threshold on any given June 30 is far above 22%. The market was structurally underpriced at open relative to historical frequency data.

The $155,070 in total volume is a meaningful signal for a single-day weather market. Liquidity stood at $137,221, which supported reasonably efficient price discovery in the final 24 hours. The 24-hour volume of $97,829 represents 63% of total volume, confirming that traders only developed strong conviction once the resolution window was imminent. Earlier in the market’s life, the low opening price attracted capital that stood to gain significantly from a climatologically expected outcome.

What the Chengdu Temperature Resolution Means Going Forward

For climate and weather markets structured around single-day temperature thresholds, the Chengdu June 30 resolution is a useful calibration point. A 22% opening price on a threshold that matches a city’s climatological average high represents a mispricing opportunity. Traders who understood Chengdu’s seasonal temperature profile and entered early captured substantial value. The data does not care about the politics of how markets get initially seeded.

Here is what the measurements are telling us about market design. Binary structures on single-day temperature outcomes are highly sensitive to the chosen threshold. A 30°C line for late June Chengdu is near the historical median, making YES and NO roughly equivalent in base-rate terms. Yet the market opened at 22%, suggesting the initial pricing reflected either thin participation or anchoring below the climatological midpoint. That gap between science and pricing is where the interesting questions live.

• Chengdu’s June 30 average high of approximately 30°C gives future YES positions on this threshold a base-rate probability near 50%, not 22%.
• The $97,829 in 24-hour volume confirms late-market price discovery accelerates sharply when resolution is imminent and outcome signals strengthen.
• Single-day city temperature markets with thresholds near historical averages will continue to attract mispricing at open, particularly when initial liquidity is thin.
• Polymarket’s science category is pricing weather uncertainty, not science. Traders who anchor to climatological data consistently outperform those who treat these markets as coin flips.

LINES RESOLUTION VERDICT

RESOLVED YES: UNDERPRICED AT OPEN

The market correctly resolved YES, but the 22% opening price badly undervalued a climatologically ordinary late-June outcome for Chengdu. The market is pricing uncertainty, not science.

What the market showed: Opening implied probability of 22% vs. final price of 1.00 (100%) vs. actual outcome of 30°C or higher confirmed. The market opened more than 50 points below the climatological base rate for this threshold on this date, representing a significant early mispricing that corrected sharply in the final 24 hours.