Highest temperature in Paris on July 27?

Platform comparison

Market context

On 27 July 2026, the highest temperature recorded at Paris-Le Bourget Airport will determine which range this market resolves to. The settlement window closes at midday UTC, capturing the full calendar day's peak temperature in Celsius. Wunderground's historical data for this station serves as the authoritative source, with resolution contingent on their archive reflecting the actual meteorological reading.

Paris experiences peak summer heat in late July, with historical highs typically ranging from 25°C to 35°C at Le Bourget. The 0% crowd probability suggests traders are either awaiting range options or treating this as a placeholder contract. Comparable July dates show considerable variance: the station recorded 34.6°C on 27 July 2015 and 28.1°C on 27 July 2019, illustrating the difficulty in pinpointing daily extremes without seasonal forecasts or anomalous weather patterns materialising months ahead.

Traders monitoring this contract should track European summer weather patterns as June 2026 approaches, particularly Atlantic pressure systems and any developing heat domes across Western Europe. Météo-France and ECMWF seasonal outlooks will provide directional signals by late spring. The contract's settlement depends entirely on Wunderground's historical database accuracy; any discrepancies between reported and archived temperatures could create disputes. Given the 18-month lead time until resolution, liquidity and implied probabilities will likely remain thin until late June, when deterministic forecasts become actionable.

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 — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

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

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

How volatile are crypto prediction markets?

Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.

Which crypto markets exist on Polymarket?

Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.

Are crypto prediction markets taxable in the US?

In the US, prediction market gains are typically treated as ordinary income or short-term capital gains depending on holding period. Consult a tax professional for your specific situation — we cannot provide tax advice.