Highest temperature in NYC on July 12?

Platform comparison

Market context

New York City is currently enduring a severe heatwave, with LaGuardia Airport hitting 102°F on 4 July and sustaining record-breaking midnight temperatures of 94°F, setting a volatile backdrop for the 12 July settlement. The crowd-implied probability of 0% YES suggests the market believes the day will not reach the highest possible temperature range, yet historical July data at LaGuardia shows daily highs frequently climbing between 91°F and 98°F, with records reaching 107°F in 1966[2][10]. This 0% pricing appears to treat the upper range as an extreme outlier, ignoring that the current heatwave has already pushed readings well above the average July high of 87°F, creating a potential value spot for contrarian traders who recognise that mid-July in NYC often delivers temperatures in the 90s rather than the cool 70s implied by the consensus[2][9].

Traders should monitor the persistence of the current heat dome, which has kept overnight lows unusually high between 65°F and 76°F, reducing the diurnal cooling necessary to suppress daytime peaks[2]. The primary catalyst is the National Weather Service’s daily climatological report, which will confirm if the heatwave persists through the settlement window, as the current trend shows no immediate break in the high-pressure system responsible for the 4 July record[9]. With the heatwave already establishing a new baseline for midnight temperatures, the dependency on sustained atmospheric pressure patterns suggests the 12 July high could easily breach 95°F, challenging the 0% market assumption that such extremes are impossible[1][3].

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

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

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 Who Will Win. 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 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 Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.