Highest temperature in London on June 12?

Platform comparison

Active sub-markets

Market context

The settlement hinges on the single highest temperature reading at London City Airport on 12 June 2026, measured in Celsius and resolved via Wunderground's historical weather data. The 0% crowd probability reflects the market's current state rather than meteorological certainty; temperature prediction markets typically see meaningful probability mass only as the settlement date approaches and forecast confidence improves.

London's June temperatures have historically ranged between 15°C and 28°C, with the airport station recording extremes tied to broader atmospheric patterns across south-east England. The 12th falls within early summer, when high-pressure systems can occasionally push readings into the low 30s, though such events remain uncommon. Comparable June settlement windows show traders typically begin positioning 10–14 days ahead once numerical weather prediction models stabilise their medium-range forecasts. The current flat probability distribution suggests traders are awaiting model consensus before committing capital.

Key catalysts include the release of extended-range forecasts from the UK Met Office and European Centre for Medium-Range Weather Forecasts (ECMWF) in the fortnight preceding settlement. Persistent high-pressure anomalies or Atlantic ridge positioning would shift probability towards higher temperature brackets. Traders should monitor Wunderground's historical data feed for any station maintenance or sensor recalibration that might affect reading reliability. USDC settlement occurs post-resolution; funding rates and whale flows on btc-prediction.bet will likely remain subdued until forecast models show material divergence from climatological norms.

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.

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.

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, 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.