Highest temperature in Beijing on July 12?

Platform comparison

Market context

Beijing is currently experiencing peak summer heat as the settlement window for the July 12 temperature contract closes in just one hour. The market assigns a 0% implied probability to any outcome, suggesting the crowd expects the day’s maximum temperature to fall outside the defined range, despite historical data showing July as Beijing’s hottest month with peaks frequently reaching 40°C[1]. This zero-probability stance diverges sharply from the physical reality of the region, where daily highs in mid-July average 31°C and rarely drop below 26°C, often exceeding 35°C during heatwaves[2].

Historical precedents frame this probability as an outlier rather than a consensus. In 2023, Beijing recorded a monthly high of 40°C, and the Nanjiao observatory recently breached this threshold during an unprecedented July heatwave that swept across China[1][5]. Reuters confirms that China experienced its hottest July in recent history in 2024, with national averages eclipsing previous records[9]. The current 0% line ignores these established patterns of extreme heat, creating a significant divergence between prediction-market odds and the analyst consensus on seasonal temperature ceilings for the North China Plain.

Traders should monitor the live Wunderground feed for the Beijing Capital International Airport Station, which serves as the definitive resolution source[10]. No further announcements or schedules remain relevant as the event is occurring in real time; the only dependency is the final hourly reading before the 12:00 UTC cutoff. Given the intensifying heat dome over the North China Plain that recently drove maximums to 37°C or higher on early July dates, the absence of any positive probability mass suggests a potential mispricing relative to the active weather conditions[10].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.