Highest temperature in Madrid on July 21?

Platform comparison

Market context

On 21 July 2026, the highest temperature recorded at Adolfo Suárez Madrid-Barajas Airport will determine the settlement outcome. This market resolves using Wunderground's historical weather data for that specific station, with the final reading locked at 12:00 UTC. Madrid's summer temperatures routinely exceed 35°C; the city's all-time July record stands at 42.2°C, recorded in 2022. The 0% crowd probability suggests traders are either awaiting range definitions or treating this as a calibration exercise pending full market launch.

Historical July data from Madrid-Barajas shows median highs around 33–35°C, with extremes clustering between 30°C and 40°C depending on Atlantic weather patterns and Saharan dust transport. Recent summers (2022–2024) have seen more frequent excursions above 38°C, reflecting broader European heat trends. Comparable July dates in 2023 and 2024 recorded peaks of 36–37°C at the airport station, providing a baseline for assessing which temperature bands carry realistic probability weight.

From a regulatory standpoint, this weather derivative falls under German GlüStV oversight if accessed from Germany, whilst US CFTC jurisdiction applies to US persons regardless of location. Polymarket's no-KYC threshold of $1,500 USD per market means traders can participate in this specific contract without identity verification up to that stake limit, though higher positions trigger standard compliance requirements. Settlement depends entirely on Wunderground's archived data feed; traders should verify station continuity and sensor calibration protocols before committing capital.

Methodology

This overview of Highest temperature in Madrid on July 21? reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.

Resolution & payout

On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.

FAQ

Do I need to KYC for Polymarket Legal UK?

Not for lifetime trading volume under $1,500. Above that threshold, a quick KYC flow kicks in — ID, selfie, approximately 5-10 minutes. The threshold matches FATF travel standards for unregulated crypto platforms.

Can I trade anonymously?

Pseudonymously, yes — up to the KYC threshold. Polymarket Legal UK stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.

Are prediction markets gambling?

Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.

Is there a withdrawal cap?

No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).

What if regulation changes?

If regulation changes in your jurisdiction (e.g. prediction markets are banned), Polymarket Legal UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.