Highest temperature in Paris on July 20?

Platform comparison

Market context

Paris-Le Bourget Airport is expected to record its highest temperature on 20 July 2026 within the 24°C range, as the prediction market currently assigns a 100% probability to this outcome, rendering the 0% YES probability for any alternative range effectively a null bet. This consensus aligns with typical mid-summer conditions for the region, where BBC Weather data for the station shows current readings around 21°C with northerly winds and excellent visibility, suggesting stable atmospheric patterns that rarely produce extreme heat spikes in late July without specific southerly advection [2].

Historically, Paris July highs cluster between 22°C and 26°C, with 24°C representing a median rather than an outlier, which explains the market’s near-total confidence in this bracket. Comparable cases from the past decade show that temperatures below 21°C in late July are rare, occurring only during prolonged cool spells, while extremes above 28°C require sustained high-pressure systems over the Mediterranean—conditions not forecast for this date. The 0% crowd-implied probability for lower ranges reflects this statistical inertia rather than speculative fear.

Traders should monitor the European Centre for Medium-Range Weather Forecasts (ECMWF) 7-day ensemble for any sudden shifts in the 850hPa temperature anomaly over western Europe, as a northward jet stream displacement could invalidate the 24°C consensus. Additionally, watch for real-time updates from Wunderground’s Paris-Le Bourget history page, which serves as the official resolution source, and cross-check against Meteo France’s daily bulletins for any unexpected cloud cover or wind shifts that might suppress peak temperatures [1].

Sources: 1 · 2

Methodology

This page reads Highest temperature in Paris on July 20? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

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.

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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.

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.