Highest temperature in NYC on July 30?

Platform comparison

Market context

The contract settles on the highest temperature recorded at LaGuardia Airport on 30 July 2026, so the key question is whether the airport peak landed in the upper 80s, low 90s or higher. Public forecast pages for New York City around the day showed highs in the high 80s to mid-90s Fahrenheit, which would make an 0% crowd price look conservative if those expectations were realised at the station rather than broadly across the city.[1][5][8]

The main historical framing is that New York summer highs are often limited by sea breeze, cloud cover and afternoon convection, but heat-wave episodes can still push LaGuardia into the 90s. The 2026 North American heat wave had already produced multiple daily and regional temperature extremes elsewhere in the eastern US earlier in July, including 100°F-plus readings in several cities, which is the sort of broader synoptic setup that can lift airport highs above normal even when Manhattan forecasts look only moderately hot.[6][14]

For traders, the useful catalysts are the actual Wunderground station observation and any late-day forecast revisions from the National Weather Service or major forecast providers, because this market resolves to the station’s recorded daily high, not a citywide average.[8][11] Since settlement is in USDC on-chain, the pricing can also move with broader crypto risk sentiment: BTC and ETH volatility, exchange funding, and whale flows can affect short-term market depth, even though the underlying event is purely meteorological.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in NYC on July 30? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

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.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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.

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.