Highest temperature in Houston on July 23?

Platform comparison

Market context

Polymarket has this Houston heat contract priced at **0% YES**, even though the market is ultimately about whether the daily high at William P. Hobby Airport lands in the relevant Fahrenheit band recorded on Wunderground. For a trader holding USDC on Polygon, the key point is that the conditional token settles only on the airport station’s *observed* maximum for the day, not on a citywide forecast or a generic Houston temperature reading. July in Houston is structurally hot: average highs are around **93°F**, with muggy conditions essentially constant through the month, which is why the market is naturally exposed to an upper-tail summer heat print rather than a mild outcome.[3][2]

The historical read-through is straightforward: a zero-priced contract usually implies the crowd sees the specified range as very unlikely, but in Houston the baseline climate still produces frequent low-to-mid 90s Fahrenheit afternoons in July.[3] A current BBC Weather reading for Houston shows **82°F** with **62% humidity** and a northerly breeze, which underlines that the city can sit near summer warmth even before the usual daytime peak.[1] For a market like this, the important comparison is not whether Houston is hot in general, but whether the station’s highest reading clears the threshold attached to the YES side.

A trader watching catalysts should focus on the local daytime heating window, cloud cover, rain chances, and any shift in wind direction or humidity that could cap the afternoon high. Houston’s July climate still leaves meaningful room for the thermometer to overshoot if skies stay bright, but brief showers or persistent cloud cover can blunt the peak and keep the airport reading lower than headline city forecasts suggest.[3] Because settlement depends on the Wunderground history page for KHOU, the final datapoint is the station maximum rather than broad-market weather rhetoric, so live forecast updates and the eventual daily observed high matter more than the morning price alone.

Sources: 1 · 2 · 3

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.

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 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.