Highest temperature in London on June 17?

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Market context

The settlement hinges on the single highest temperature recorded at London City Airport on 17 June 2026, measured in degrees Celsius and resolved against historical data from Weather Underground. The 0% crowd probability suggests traders are either uncertain about the specific temperature range options available or treating this as a placeholder market ahead of formal launch.

London's June climate typically produces highs between 20–23°C, with occasional warm spells pushing into the mid-to-high 20s. The Met Office's 30-year average for mid-June in central London sits around 21°C. Extreme heat—temperatures exceeding 28°C—occurs roughly once every five to ten years during June, making such outcomes statistically uncommon but plausible. The record high for June in London stands at 32.0°C, set in 1976, providing an upper bound for what's physically possible on any given day.

Traders should monitor the UK's seasonal weather patterns as spring 2026 progresses, particularly any emerging signals from the Met Office's long-range forecasts issued in April and May. Atlantic pressure systems and potential heat domes from continental Europe drive June temperature variance; early indicators of a high-pressure system establishing over the British Isles would shift probabilities toward warmer outcomes. The absence of current market activity (reflected in the 0% reading) likely reflects that resolution brackets have not yet been formally published, making comparative odds across other prediction platforms unavailable at present.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

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

Where can I trade this market with the lowest fees?

On Best Prediction Markets, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 does it cost to trade on Best Prediction Markets?

Zero. Best Prediction Markets 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.