Highest temperature in NYC on July 22?

Platform comparison

Market context

LaGuardia’s highest temperature on 22 July will be determined by the day’s peak reading in the airport station data, and the market settles only after the first data point for the following date appears on the Wunderground history page. With the current crowd-implied probability at 0% YES, the contract is pricing an outcome that the final published maximum lands outside the active temperature band or that traders see the setup as effectively over with the answer already implied by weather conditions and the settlement source.[1]

The historical frame matters because late-July New York City often sits in the upper 70s to low 80s Fahrenheit, with normal highs around 30°C and humid conditions that can push realised airport temperatures a few degrees above the broader city average.[2] That makes the market sensitive to whether the day turns into a straightforward summer warm-up or a sharper heat event, and the 0% YES price suggests participants are not leaning towards an extreme reading. A similar mid-July regional heat pattern earlier in 2026 did produce record-breaking East Coast temperatures, showing that short-lived heat spikes can still alter outcomes quickly when synoptic conditions align.[3]

For traders, the key catalysts are the usual weather drivers: National Weather Service updates, any coastal front or thunderstorm timing, and whether the post-heatwave moderation already signalled in ensemble guidance holds through the afternoon peak.[1] In prediction-market terms, the final number is a pure weather-and-data exercise: the move is determined by the observed LaGuardia maximum, then settled in USDC once the source publishes the official daily record, so late revisions matter less than the first confirmed reading.

Sources: 1 · 2 · 3

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.