Highest temperature in Toronto on June 25?

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Market context

The underlying event is the highest temperature recorded at Toronto Pearson International Airport on 25 June 2026, measured in degrees Celsius and sourced from Wunderground. Current crowd-implied probability sits at 0% for the market resolving to a specific outcome, yet historical data from the same period in 2026 shows the temperature reached 18°C at 17:00, with daily highs in June typically ranging between 20°C and 26°C. Comparable markets from June 24 and June 22 reveal that 24°C and 20°C were the frontrunners respectively, suggesting that a 0% probability for the current market may reflect a mispricing or an early liquidity phase rather than a genuine impossibility of the event occurring.

Traders should monitor official Environment Canada forecasts for late June 2026, as sudden shifts in cloud cover or wind direction from the southeast could alter the daily high. A recent report from WeatherSpark indicates that June 2026 has seen consistent warming trends, with Pearson Airport recording highs up to 26°C in mid-June, which implies that the 0% probability may not account for the full volatility of the season. The key dependency is the release of the final Wunderground dataset at the settlement window, which will confirm the exact temperature range and determine the market resolution.

Regulatory frameworks such as the German GlüStV and US CFTC reach impose strict KYC requirements on prediction markets, yet the "no-KYC up to $1,500" provision allows traders to access this specific market without identity verification for smaller stakes. This accessibility is particularly relevant for weather-based markets, where the resolution is objective and data-driven, reducing the risk of manipulation. However, traders must remain aware that exceeding the $1,500 threshold will trigger mandatory KYC checks, aligning with international anti-money laundering standards and ensuring compliance with local gambling regulations.

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Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

Is this market available outside the US?

PolyGram 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, PolyGram 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.