Highest temperature in NYC on July 27?

Platform comparison

Market context

On 27 July 2026, the highest temperature recorded at LaGuardia Airport will settle this market into one of several predefined ranges. The National Weather Service maintains continuous records at KLGA, with Wunderground archiving daily highs that form the resolution baseline. Settlement occurs at 12:00 UTC on that date, locking in whichever temperature band contains the peak reading from the full calendar day.

New York's July climate presents a constrained forecast window. Historical data from the past two decades shows LaGuardia's July highs cluster between 82°F and 92°F, with extreme outliers rare. The 0% crowd probability suggests traders are pricing in either extreme confidence in a specific range or genuine uncertainty about which band will resolve. Comparable July 27 records from prior years—such as 2023's 87°F high or 2019's 89°F—anchor expectations within a narrow band, though Atlantic tropical systems or heat domes can shift outcomes materially.

Traders should monitor National Weather Service forecasts released in the week preceding 27 July, particularly any alerts for heat advisories or tropical cyclone activity affecting the Northeast. Climate models from NOAA and the European Centre for Medium-Range Weather Forecasts typically converge 5–7 days ahead, providing actionable signals. Real-time atmospheric pressure and sea-surface temperature anomalies in the Atlantic will indicate whether conditions favour above-normal or below-normal July temperatures. The settlement mechanism ties directly to Wunderground's historical archive, eliminating discretionary interpretation; traders need only assess meteorological probabilities against the available range options.

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 volatile are crypto prediction markets?

Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.

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.