Highest temperature in Madrid on July 22?

Platform comparison

Market context

Madrid’s airport is expected to post a very hot afternoon, and the market is being settled off the highest reading at Adolfo Suárez Madrid-Barajas Airport rather than the city forecast headline. That matters because airport stations can differ by a degree or two from central Madrid, and the exact intraday peak is what decides the band, not the daily maximum reported elsewhere. Wunderground is the specified resolution source, so late-day warming, brief cloud cover, or a small timing shift in the peak hour can still move the result between adjacent buckets.

The current 0% implied chance for **YES** sits far below the live market pricing on the same event, where 39°C is the clear frontrunner at 77% and 40°C is next at 21%. Independent Spanish-language forecasts also cluster around the high-30s: Infobae has a 39°C high with no rain, while Clarin shows 38°C, which is consistent with a market centred on a scorching but not exceptional Madrid heat day.[1][2][3] In practice, that means the spread between 39°C and 40°C is the key threshold, not the broader question of whether it will be hot.

For traders, the main catalysts are the afternoon evolution of the heat at the airport and any shift in the local forecast as the day develops. Because settlement is in USDC on-chain, positioning tends to react quickly to fresh weather updates, but there is no obvious BTC or ETH macro driver in the event itself; any crypto linkage is mainly through general risk appetite rather than the weather outcome. The most relevant dependencies are the official Wunderground reading at the airport and whether short-term forecast updates continue to favour a 39°C print or open the door to 40°C.

Sources: 1 · 2 · 3 · 4

Methodology

This page reads Highest temperature in Madrid on July 22? 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.

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.

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.