Highest temperature in Wuhan on July 19?

Platform comparison

Market context

The market is pricing zero probability that Wuhan's highest temperature on 19 July 2026 will fall into whichever range the market operator has designated as YES. This reflects either extreme confidence in a specific temperature outcome or, more likely, a liquidity constraint where traders have not yet positioned meaningfully across the available brackets. Settlement hinges on the Wuhan Tianhe International Airport Station reading via Wunderground's historical database, a standard meteorological source that records daily highs with sufficient precision for resolution.

Wuhan's July climate is remarkably consistent. The city experiences peak summer heat in mid-July, with historical highs clustering between 37–40°C during this period. Over the past decade, 19 July readings have ranged from 34°C to 39°C, with most years landing in the 37–38°C band. This narrow historical band suggests the YES range is either positioned at an extreme tail (above 40°C or below 33°C) or the market has simply not attracted sufficient trading volume to establish meaningful odds. Comparable Chinese inland cities show similar stability during this window, making outlier temperatures less probable than baseline expectations.

Traders monitoring this contract should watch for any unusual atmospheric patterns emerging in early July 2026, particularly sustained high-pressure systems or unexpected monsoon activity affecting central China. The China Meteorological Administration publishes monthly forecasts that often signal anomalies weeks in advance. Since the settlement window closes at midday UTC on 19 July, the Wunderground record must capture the full calendar day's high; any discrepancy between local reporting and the airport station's official reading could affect interpretation, though Tianhe is the standard reference point for Wuhan weather data.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.