Highest temperature in NYC on June 21?

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Market context

The real-world event hinges on the highest temperature recorded at LaGuardia Airport on 21 June 2026, a date that historically coincides with the summer solstice and peak solar intensity for the Northeast. Current crowd-implied probability sits at 0% for a "YES" outcome, suggesting the market expects temperatures to remain within a lower, non-threatening range, yet this contradicts the immediate meteorological backdrop of a scorching heatwave gripping the region.

Historical precedents frame this low probability as potentially misaligned with reality, given that Central Park recently hit 102°F, marking the hottest June day since records began and smashing a 30-year benchmark set in 1962 [2][3]. Falconer, New York, also recorded 103°F on 21 June 1988, proving that this specific date has a documented capacity for extreme heat [9]. With LaGuardia’s normal maximum for June being 83°F and the record standing at 98°F from 2012, the current heatwave pushing temperatures well above seasonal averages suggests the 0% probability may ignore the volatility of solstice weather [2][6].

Traders must monitor the National Weather Service’s excessive heat warnings, which cover almost every county in the Northeast, as these indicate dangerous conditions likely to persist until the weekend [2]. The primary catalyst is the combination of intense afternoon sun and rising humidity, which creates oppressive heat indices that feel significantly hotter than the actual air temperature [2]. Whale flows and funding rates on crypto exchanges may react if this weather event triggers broader climate-related macro concerns, but the immediate dependency remains the Wunderground data feed for LaGuardia, which will confirm if the solstice heat exceeds the 98°F threshold [2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in NYC on June 21? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed for comparison. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Is this market available outside the US?

BTC Prediction is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, BTC Prediction triggers a quick verification flow that finishes in 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.