Highest temperature in NYC on July 5?

Platform comparison

Market context

The contract for New York City’s highest temperature on 5 July 2026 at LaGuardia Airport currently trades at 0% probability for a YES outcome, implying the market expects the peak heat to fall well below the threshold required for resolution. This pricing reflects a stark divergence from the on-chain reality where USDC settles conditional tokens on Polygon, yet the crowd has already dismissed the event as implausible. Traders watching the Polymarket interface see a flat line, suggesting no significant capital is betting on an extreme heat spike for that specific date.

Historical data frames this dismissal with compelling evidence: LaGuardia recently recorded 102°F on a Thursday during a severe heatwave, with midnight temperatures hitting 94°F, breaking the 2013 record of 93°F[1][3]. While July 2026 forecasts suggest daily highs between 73°F and 88°F[5], the recent spike to 104°F in neighbouring New Jersey and Newark indicates that extreme heat events are possible in the region[6][8]. However, the 0% pricing suggests the market believes the specific 5 July date will not replicate these record-breaking conditions, despite the broader heat dome persisting.

Traders should monitor the National Weather Service’s daily heat advisories and the specific timing of the high-pressure dome over the tri-state area, as these are the primary catalysts for temperature spikes. Recent reports confirm forecasters expect temperatures to soar to 104–105°F in New Jersey due to a massive dome of high pressure[6]. If this dome shifts directly over LaGuardia on 5 July, the 0% probability could collapse, but until official announcements confirm a direct hit, the on-chain mechanics will likely maintain the current flat pricing.

Sources: 1 · 2 · 3 · 4 · 5

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

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.