Highest temperature in Shanghai on May 22?

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Market context

Shanghai’s temperature for 22 May will be set by the highest reading logged at Pudong International Airport and then converted into the market’s settlement range once the Wunderground history page is finalised. For a late-May Shanghai day, the climatology is mild to warm rather than hot: typical highs are around 24–25°C, with a normal range broadly from the high teens to the mid-20s. That puts the most common outcome in the lower and middle Celsius bands, not the upper tail, and helps explain why any move into materially hotter buckets would need an above-normal afternoon.

Comparable May readings in Shanghai generally cluster near the low-to-mid 20s°C, with weather references noting average highs rising from about 21°C towards 25°C across the month and frequent cloud or light rain. The market’s current 0% implied probability for YES is therefore consistent with a contract that is still pending final observation rather than a strong view on an extreme temperature. In this kind of event, the on-chain side is straightforward: once Wunderground finalises the airport high, the USDC-settled market resolves mechanically to the relevant range, so the key question is not interpretation but whether the recorded peak lands in a cooler or warmer band.

Traders should watch the afternoon local forecast for Shanghai Pudong, especially any shift in cloud cover, rain, or convective heating, because the daily maximum often arrives in mid to late afternoon. The wider macro backdrop matters only at the margin: stronger BTC or ETH volatility can affect attention and liquidity on crypto-native prediction markets, but the contract itself is driven by local weather data, not market flow. Any late revisions from the airport station report, or discrepancies between forecast and archived observation, are the main practical catalysts before settlement.

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

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.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in 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.