Highest temperature in Chongqing on August 4?

Platform comparison

Market context

Chongqing’s airport station has to print the day’s top Celsius reading, and in early August that usually means dealing with severe heat rather than a mild summer high. Long-run August climate references put Chongqing among China’s hottest large cities, with average highs around 34°C and some historical August 4 readings close to 34.6°C, while other summaries say extreme midsummer spikes can reach the high 30s to low 40s°C.[1][5][7]

That context helps explain why a 0% implied chance on a specific temperature range can be misleading if the market is narrowly mapped to one band: the most likely outcome is still a hot afternoon print, but the exact bucket depends on whether cloud cover, rain, or a late-day surge lifts the airport station above the forecast consensus.[1][11][12] For comparison, recent weather coverage has also described Chongqing as being under heatwave conditions, reinforcing that elevated temperatures are not an outlier in this part of the summer.[19]

Traders should watch the local forecast cycle, especially any updates showing convection, rainfall, or a weaker-than-expected daytime heating profile around Jiangbei International Airport, because those factors can trim the daily maximum even when the broader city stays oppressive.[11][12] The contract settles in USDC from the Wunderground station reading, so the key mechanics are the final observed high at the named airport station rather than generic city forecasts, and any late revisions in forecast models matter more than broader BTC or ETH market moves unless they are driving risk appetite or liquidity across the venue.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

Which crypto markets exist on Polymarket?

Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.