Highest temperature in London on July 20?

Platform comparison

Market context

The market tracks the highest temperature recorded at London City Airport on 20 July 2026, with settlement tied to Wunderground data for that specific station. Trading has already closed as the event date has passed, and the market resolved to the 72–73°F range, rendering the current 0% YES probability for any unmet condition irrelevant to active positioning [1].

Historical London July highs typically cluster between 25°C and 32°C, with extreme outliers rare; the resolved 22–23°C (72–73°F) aligns with a mild summer day rather than a heatwave, suggesting the crowd’s initial 0% probability correctly anticipated no extreme temperature breach. Comparable cases from 2022 and 2023 show London City Airport rarely exceeds 35°C, reinforcing that the resolved outcome falls within normal seasonal variance.

Regulatory accessibility hinges on jurisdiction: German GlüStV classifies such weather derivatives as gambling, requiring operator licensing, while US CFTC reach extends to prediction markets deemed commodity futures, potentially triggering registration. The “no-KYC up to $1,500” threshold permits anonymous access for small retail traders in jurisdictions without strict KYC enforcement, but does not override local gambling or securities laws. Traders should monitor upcoming EU digital gambling directives and US CFTC enforcement actions on prediction platforms, as these could alter market availability or settlement mechanics.

Sources: 1

Methodology

This overview of Highest temperature in London on July 20? 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

How are winnings taxed?

Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.

Can I trade anonymously?

Pseudonymously, yes — up to the KYC threshold. Is Polymarket Legal in Canada 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.

What happens during a tax audit?

You're responsible for documenting your trades. Is Polymarket Legal in Canada exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.

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), Is Polymarket Legal in Canada would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.