Highest temperature in Toronto on May 24?

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Market context

Toronto's weather on 24 May 2026 will be shaped by late-spring atmospheric patterns typical of southern Ontario, where late May temperatures routinely exceed 20°C as the region transitions toward summer. The settlement hinges on the single highest temperature recorded at Toronto Pearson International Airport during that calendar day, measured in Celsius and resolved via Weather Underground's historical records.

May 24 climatology provides the essential frame for assessing temperature ranges. Toronto's 30-year average high for late May sits around 22–23°C, though the station regularly records peaks of 25–28°C during this period. Historical extremes for May at Pearson have reached into the low 30s Celsius on particularly warm years, whilst cooler May days occasionally remain below 15°C when cool air masses linger. The 0% crowd probability suggests traders are either awaiting clearer seasonal forecasts or treating this as a placeholder until nearer-term meteorological data becomes available.

The key catalyst will be the establishment of a high-pressure system or warm air advection pattern in the week leading to 24 May. Traders should monitor Environment Canada's extended forecasts from mid-May onwards, as these will clarify whether subtropical air reaches the Great Lakes region or whether cooler maritime influence dominates. Jet stream positioning and any lingering spring weather systems will determine whether the day trends toward the cooler end of the May spectrum or experiences the warm, settled conditions that occasionally produce temperatures in the upper 20s Celsius.

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.

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, 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.