Highest temperature in Chengdu on June 20?

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Market context

Chengdu’s hottest reading on 20 June will come from the airport station the market specifies, so the key question is whether the day’s maximum lands in the **28°C bucket** or pushes into a higher range. June normals in Chengdu are warm but not extreme: average highs edge up through the month, and typical highs are around the low 30s °C, with 35°C+ days described as occasional rather than routine.[1][2][5]

That framing helps explain why a **0% YES** price can still be read as a sceptical but not impossible view if the contract’s exact bucket is above the most common outcome. Market pricing on the similar Polymarket contract has recently clustered around **28°C at 94%**, which is consistent with late-June Chengdu often sitting below the hottest thresholds even though the city can still spike higher on some days.[3] On-chain, the settlement is straightforward: the winning range is determined by the Wunderground daily high for Chengdu Shuangliu International Airport, and final value should track that published figure rather than broader citywide weather commentary.[4]

What matters now is the intraday heat setup into the airport observation window. Traders should watch for cloud cover, rainfall, and any late-afternoon warming, because Chengdu’s June climate is humid and prone to sudden rain, which can cap the high even on otherwise warm days.[2][6] There is no obvious BTC or ETH linkage to the weather outcome itself, but if broader crypto markets are risk-off and thin, the market may still trade mechanically around USDC liquidity rather than meteorology; in that case, spot and funding conditions matter more than macro headlines.

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 — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

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

Where can I trade this market with the lowest fees?

On BTC Prediction, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

BTC Prediction is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.