Highest temperature in NYC on July 17?

Platform comparison

Market context

The market tracks the peak Fahrenheit reading at LaGuardia Airport on 17 July 2026, a specific meteorological event that will settle via Wunderground history. With the settlement window closing at 12:00 UTC on that date, the current 0% probability assigned to any single outcome is a misreading of the market structure; the platform actually distributes implied probability across multiple temperature bands rather than a binary yes/no. The frontrunner is the 86–87°F range at 35%, followed closely by 88–89°F at 30%, indicating the crowd expects a hot but not record-breaking summer day [1].

Historical context for this timeframe is defined by the extreme July 2026 heatwave that shattered records across the East Coast, breaking 14 to 154-year highs simultaneously in NYC, DC, and Atlantic City [2]. Programmatic traders should treat this as a conditional order setup where the underlying variable is the LaGuardia station’s daily maximum, not a city-wide average. The 0% figure likely reflects a user interface quirk where no single bin has reached a majority threshold, rather than a belief that the event will not occur, given the recent precedent of simultaneous record-breaking temperatures in the region [2].

A trader building an automated strategy must monitor the National Weather Service’s LaGuardia historical data feed and the specific Wunderground daily history URL for the KLGA station, as these are the definitive resolution sources [3]. The primary catalyst is the real-time temperature feed on 17 July, with no external announcements or schedules to watch, as the outcome depends solely on the physical atmosphere. Copy-trading bots should weight the 86–89°F bands heavily, as the market’s current distribution aligns with the intense heat patterns established earlier in the month, making lower ranges statistically improbable.

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

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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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'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.

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.