Highest temperature in London on June 13?

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Market context

On 13 June 2026, the highest temperature recorded at London City Airport will determine which range this market settles into. The settlement source is Wunderground's historical weather data for that specific station, measured in Celsius, with resolution occurring at 12:00 UTC on the settlement date. The 0% crowd probability suggests traders are either uncertain about the outcome distribution or awaiting clearer atmospheric forecasting as the date approaches.

London's June temperatures historically cluster between 18–24°C, with extremes occasionally reaching 27–29°C during heat waves. The City Airport station, situated in East London near the Thames, typically records slightly cooler readings than central London due to proximity to water and urban heat island effects. June 2024 saw a peak of 22.4°C in London; June 2023 reached 25.1°C. These patterns provide a baseline for evaluating which temperature brackets carry realistic settlement risk. Traders should cross-reference Met Office seasonal outlooks and historical volatility to calibrate position sizing across the available ranges.

Key catalysts include the North Atlantic Oscillation phase and Atlantic jet stream positioning in early June 2026, which determine whether high-pressure systems establish over the UK. Any significant heat dome developing across northern Europe in the fortnight before settlement would shift probability mass toward higher temperature ranges. Wunderground's historical archive updates daily, allowing traders to monitor actual conditions as June approaches and refine their forecasts accordingly.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

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

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.

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, BTC Prediction 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.