Highest temperature in Madrid on July 24?

Platform comparison

Market context

Madrid’s 24 July high will be set by the peak temperature recorded at Madrid-Barajas Airport, with settlement based on the Wunderground daily history page rather than a citywide average or forecast. A 0% yes price implies the market is effectively pricing in the listed range as already settled, so the key practical point is whether the airport’s afternoon maximum lands in the expected summer band and which bucket the final reading falls into.

The current framing is consistent with Madrid’s July climatology: average daytime highs are around 34°C, and a typical early-July range in Madrid is about 25°C to 30°C, with hotter spells pushing the city well above 35°C.[2][4] On the live regional bulletin, Madrid Aeropuerto was already at 38.7°C on 23 July, alongside several other Madrid-area stations near 38.5°C to 38.7°C, which shows the basin is capable of producing very high maxima when heat builds.[3] In that context, a 33°C frontrunner on Polymarket is not a forecast of a cool day so much as a probability-weighted bucket inside a broad summer distribution.[1]

For traders, the main catalysts are local heat-advisory updates, the evolution of Iberian high-pressure ridging, and whether hot air persists into the 24 July afternoon window before the settlement cut-off at 12:00 UTC. The most relevant dependency is the airport station itself: cloud cover, wind shift, or a morning inversion can keep the maximum down even if the wider Madrid region runs hotter. On-chain, the market’s USDC-denominated outcome can move mechanically as BTC and ETH risk sentiment affects overall sportsbook-style liquidity, but the actual settlement hinges only on the airport reading published by Wunderground.[1][3]

Sources: 1 · 2 · 3 · 4

Methodology

This page reads Highest temperature in Madrid on July 24? 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.