Highest temperature in Toronto on May 30?

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Active sub-markets

Market context

On 30 May 2026, Toronto Pearson International Airport will record a daily high temperature, with settlement determined by the precise reading captured at the station's official weather instruments. The market resolves in USDC against Wunderground historical data, making the outcome verifiable and immutable once the calendar date passes. Current crowd pricing at 0% YES suggests traders are either heavily concentrated in a specific temperature band or awaiting clarity on which range the market operator has defined.

Late May in Toronto typically sees highs between 20–24°C, though the city's climate variability means outlier days occur regularly. Historical May 30th records show temperatures ranging from 12°C in cooler years to 28°C during warm spells, with the 30-year average around 22°C. The 0% probability reading indicates either extreme confidence in a narrow outcome or liquidity concentrated elsewhere on the range ladder. Traders should examine the full market structure—whether all temperature bands are listed and whether the crowd has simply priced out certain thresholds as implausible.

Weather forecasting accuracy for a fixed date fourteen months forward remains limited; seasonal models and climate oscillations (NAO, Pacific patterns) will matter more than short-range forecasts. Spring 2026 conditions will depend partly on winter carryover effects and early-season atmospheric setup. Traders monitoring long-range climate outlooks and historical analogues for similar May conditions should watch for any market rebalancing as the settlement date approaches and deterministic forecasts become available in late May 2026.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

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 does it cost to trade on BTC Prediction?

Zero. BTC Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.

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.