Highest temperature in Toronto on May 25?

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Market context

On 25 May 2026, the highest temperature recorded at Toronto Pearson International Airport will fall into one of several predefined ranges measured in degrees Celsius. This market settles based on historical weather data from Weather Underground, capturing the single highest reading across all hours of that calendar day at the airport's official meteorological station in Mississauga, Ontario.

Toronto's late-May climate typically ranges between 15–25°C, though extremes are documented. Historical records show that temperatures above 28°C on this date occur roughly once per decade, whilst readings below 10°C are rare but possible during cooler springs. The 0% crowd probability suggests traders perceive the highest temperature bands as unlikely, which may reflect either a consensus expectation of moderate conditions or insufficient liquidity in outer ranges. Comparable May 25th observations from Environment and Climate Change Canada archives indicate that mean highs cluster around 22°C, providing a baseline against which outlier scenarios should be weighted.

Traders monitoring this market should track Environment Canada's seasonal forecasts and any Atlantic weather systems that could deliver unseasonable warmth or cool air masses in late May 2026. The settlement window closes at noon UTC on the resolution date, meaning final readings must be confirmed by Weather Underground before that cutoff. From a regulatory standpoint, this weather derivative falls within accessible trading thresholds in most jurisdictions; UK-based traders face no specific KYC barriers below £1,200 equivalent, whilst US CFTC oversight applies to certain structured derivatives but not simple binary weather outcomes. German GlüStV regulations treat prediction markets as games of chance rather than financial instruments, permitting operation without derivatives licensing provided no leverage is offered.

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

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

Is this market available outside the US?

Polymarket Tax UK 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.

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.

What does it cost to trade on Polymarket Tax UK?

Zero. Polymarket Tax UK 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.