Highest temperature in NYC on July 8?

Platform comparison

Market context

The real-world event driving this market is the peak daytime heat at New York’s LaGuardia Airport on 8 July 2026, specifically the highest Fahrenheit reading recorded between sunrise and sunset. This single data point, sourced from Wunderground, will determine whether the market resolves to the “YES” temperature range, with the current crowd-implied probability sitting at 0%—a stark signal that traders expect the day to remain cool or unseasonably mild.

Historically, LaGuardia has experienced extreme July heat, with records reaching 102°F in September 1953 and 101°F in July 2026 and June 2025, yet the current 0% probability suggests a disconnect from these precedents. A power-user evaluating this market programmatically would note that recent midnight temperatures hit 94°F on 4 July 2026, the station’s highest ever, indicating persistent heatwave conditions that could elevate daytime peaks if cloud cover or rain fails to intervene [1][2][6].

Traders must monitor the National Weather Service’s daily climatological reports for LaGuardia, which forecast July 2026 highs between 73°F and 91°F, alongside any sudden shifts in marine layer strength or precipitation schedules that could suppress temperatures [3][4]. A recent Washington Post report confirms that peak heat has already reached the Mid-Atlantic, with LaGuardia hitting 94°F at midnight on 3 July, reinforcing the need to watch for real-time dependencies like wind direction or humidity spikes that could alter the day’s maximum [9]. Without such catalysts, the 0% probability may reflect a genuine expectation of cooler-than-average conditions, but any deviation from the forecast range would warrant immediate re-evaluation of the market’s stance.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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 Polymarket Review UK 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.