Highest temperature in Toronto on June 25?

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Market context

The underlying real-world event is the daily high temperature recorded at Toronto Pearson International Airport on 25 June 2026, measured in degrees Celsius. Historical data frames the current 0% crowd-implied probability for a YES outcome as highly conservative, given that June highs at this station typically range from 21°C to 26°C, rarely dipping below 16°C. Recent comparable cases, such as the 24°C to 26°C highs recorded on 9 and 14 June 2026 in similar markets, demonstrate that temperatures consistently exceed the 24°C threshold often used as a settlement line, suggesting the market may be mispricing the likelihood of a higher reading.

Traders should monitor Environment Canada heat warnings and local weather schedules, as extreme heat events can push temperatures significantly above seasonal averages. A recent heat warning issued for the Greater Toronto Area, which saw temperatures reach 33.7°C at Pearson Airport, illustrates the volatility potential when atmospheric conditions shift rapidly. While crypto macro factors like BTC/ETH funding rates or whale flows do not directly influence weather outcomes, on-chain mechanics such as USDC settlement speed and exchange spot liquidity remain critical for executing trades efficiently when new weather data emerges from sources like Wunderground.

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Methodology

This page reads Highest temperature in Toronto on June 25? 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

Where can I trade this market with the lowest fees?

On BTC Prediction, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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?

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