Highest temperature in Madrid on May 22?

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Market context

Madrid’s Airport Station could still reach a fairly warm late-spring afternoon, but the benchmark here is the highest temperature recorded by 12:00 UTC on 22 May, not the citywide daily maximum. May in Madrid is typically mild to warm, with average highs around 22°C to 26°C and lows near 10°C to 13°C, while the later part of the month often trends a little warmer than the start. Nearby long-run climate guides and weather archives put May peaks most commonly in the low-to-mid 20s Celsius, with much hotter readings possible only in brief warm spells.

That context helps explain why a 0% YES price can sit in place if the contract is set around a narrow upper range. Forecast distributions for Madrid in May often cluster well below true heatwave territory, and the airport’s elevation and early-day settlement cut-off make the highest reading more dependent on the morning warm-up than on any late-afternoon surge. Comparable Madrid weather records show that extremes above 40°C are rare and belong to midsummer, not May, so the market is really about whether the day briefly clears into an unusually warm band rather than anything extreme.

The main catalysts are the hourly forecast updates for Madrid-Barajas, cloud cover and wind direction, and whether a short-lived southerly flow or clear-sky heating develops before the noon UTC cut-off. Traders should watch the Wunderground daily history page for the final hourly maximum, alongside official Spanish and airport observations where available. In broader crypto terms, the contract settles in USDC on-chain, so BTC and ETH swings are mostly background unless they affect venue liquidity or funding-driven risk appetite; the actual outcome still comes down to one local temperature print at LEMD.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Madrid on May 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 for comparison. Every CTA routes to PolyGram, 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

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in 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.