Trade: Highest temperature in Toronto on May 11?

Market context

On 11 May 2026, the highest temperature recorded at Toronto Pearson International Airport will fall within one of several defined ranges in Celsius. The settlement will draw from historical weather data recorded at this station, with Wunderground's archive serving as the authoritative source. Current order book activity on Polymarket reflects a 0% implied probability across all temperature brackets, indicating either minimal trading volume or a technical issue in price discovery at this early stage.

Toronto's May temperatures typically range between 15°C and 25°C, with historical highs occasionally reaching 28–30°C during warm springs. The 11 May date falls within the shoulder season when weather patterns can shift significantly; comparing to recent years shows considerable variance. In 2023, Toronto recorded 26.5°C on this date, whilst 2022 saw 20.1°C. This historical spread of roughly 6–7°C between comparable years demonstrates why temperature range markets require careful calibration of probability across multiple brackets rather than concentration in a single outcome.

Traders should monitor Environment and Climate Change Canada's seasonal forecasts and any emerging atmospheric patterns in late April 2026, as these typically provide the most reliable indicators for early May conditions. The settlement window closes at midday UTC on 11 May, meaning North American morning weather developments will be critical to final resolution. Any significant high-pressure systems or cold fronts tracking through Ontario in the days preceding the date would materially shift expectations across the available ranges.

Resolution source

This market settles from the official outcome published at https://www.wunderground.com/history/daily/ca/mississauga/CYYZ. A proposer submits the final result to the UMA optimistic oracle on Polygon; the two-hour dispute window closes and payouts clear in USDC.

How to trade this market step by step

The mechanics for trading "Highest temperature in Toronto on May 11?" are the same as any other PolyGram event contract. Each YES share resolves to $1 if the event happens, or $0 if it doesn't. The current price between 0¢ and 100¢ is the market's probability estimate, set live by the order book.

1. Sign in on polygram.ink with your email — no full KYC under $1,500 lifetime trading volume.
2. Deposit USDC on Polygon (lowest fees, ~$0.01 per transaction) or Ethereum. Funds credit after 12 confirmations.
3. Pick a side. Buy YES if you believe the event will happen; buy NO if you think it won't. The current YES price reflects the market's collective probability.
4. Size your position. If you stake 100 USDC at 50% YES, you'll receive shares that pay $200 if YES resolves true — a 100% gross return. If NO resolves, your shares are worth $0.
5. Set risk controls (optional). Stop-loss, take-profit, and limit-order types all supported. Use the trade ticket's slippage box to cap your maximum entry price.
6. Wait for resolution. When the event resolves on-chain via the UMA optimistic oracle, the winning side settles to 100¢ automatically and USDC hits your balance within seconds. Withdrawable to any wallet you control.

How active is this market?

$24K in lifetime turnover and $4K of resting liquidity puts this market in the around the median by volume for weather contracts on PolyGram. Order-book depth is thin — large orders may need to be split across the book or executed as limit orders.

Last 24 hours alone saw $17K in turnover, well above the lifetime daily-average for this market — a clear sign of news catalysing trader activity right now.

The market has been open for under a month — fresh enough that information asymmetry remains a real factor.

Higher-volume markets tend to have tighter spreads and faster price discovery — meaning the displayed YES/NO percentages are more likely to reflect the true crowd-implied probability rather than a single trader's directional view.

Key terms

YES / NO share

A binary outcome token that pays $1.00 if the underlying claim resolves true (YES) or false (NO), and $0 otherwise. The market price between 0¢ and 100¢ is the implied probability.

CLOB

Central limit order book. The matching engine that pairs YES buyers with NO buyers (effectively the same trade). Polymarket's CLOB on Polygon executes trades on-chain via the conditional-tokens framework.

Liquidity

USDC capital sitting in resting limit orders inside the order book. Deeper liquidity means smaller slippage on large trades and a tighter bid-ask spread.

UMA optimistic oracle

The on-chain dispute system that settles each Polymarket market. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution.

Slippage

The difference between the displayed mid-price and your fill price. Affects market orders most; limit orders avoid slippage but may take time to fill.

Conditional token

ERC-1155 outcome share issued by Gnosis Conditional Tokens on Polygon. The token type that resolves to $1.00 or $0.00 at settlement.

See the full prediction-market glossary →

Frequently asked questions

Risk and regulatory note

Prediction-market positions can lose 100% of staked capital. Outcomes are uncertain by definition — historical accuracy of crowd-implied probabilities is high in aggregate but not for any single market. PolyGram does not provide investment advice. Trade only with capital you can afford to lose.

Regulatory status varies by jurisdiction. Germany, the United States, and most EU countries treat Polymarket-style event contracts under one of three frameworks: financial derivative, gambling product, or unregulated novel asset. Consult local counsel before trading.

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