Highest temperature in NYC on July 23?

Platform comparison

Market context

The day’s high at LaGuardia Airport is the real-world event behind this contract, and the market is currently trading as if the answer is *not* one of the hotter bands. On the available Polymarket snapshot, the front-runner is **80-81°F at 72%**, with **82-83°F at 19%** next, which implies most traders expect a warm but not exceptional late-July reading. That sits awkwardly against the contract’s own framing: the resolution source is a single airport station, so local cloud cover, sea breeze, and timing of peak heating matter more than citywide “New York” weather headlines.[1]

For historical context, New York’s summer highs often cluster in the upper 70s to low 80s, so a band around 80°F is not unusual even if it is the market favourite. A recent July heatwave across the East Coast did produce record-breaking temperatures in several locations, showing that a broader regional setup can occasionally push forecasts higher than seasonal norms, but that does not automatically translate to LaGuardia on any given day.[2] The current 0% YES impression is therefore easy to read as a strong lean against a top-end spike, rather than a view that the airport will be cool.

The main catalysts are operational rather than financial: traders should watch the midday heating cycle, airport-specific METAR-style observations, and any updated local forecast guidance that changes the expected peak before the settlement window closes at 12:00 UTC. There is no obvious sportsbook analogue for this exact contract, so the cleanest comparison is between the market’s band pricing and the weather consensus embedded in public forecasts; with Polymarket’s pricing concentrated in 80-83°F, any analyst view calling for a broader heat spike would need a clear meteorological trigger, not just seasonal warmth.[1]

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.