Highest temperature in Guangzhou on July 21?

Platform comparison

Market context

On 21 July 2026, the highest temperature recorded at Guangzhou Baiyun International Airport Station will determine which Celsius range this market resolves to. Guangzhou experiences a subtropical humid climate with peak summer heat typically occurring in July; historical daily maxima for this period routinely exceed 33°C, with occasional readings above 35°C during heat waves. The settlement window closes at 12:00 UTC on that date, capturing the full diurnal cycle at the airport's official weather station.

The 0% crowd probability reflects either extreme confidence in a specific temperature band or sparse trading activity. Comparable July temperature records for Guangzhou show consistency: the city has recorded temperatures between 34–37°C during mid-summer over the past decade, with 2022 and 2023 both posting peaks near 36°C. Wunderground's historical archive for this station provides the definitive baseline; traders should cross-reference multi-year July patterns to calibrate expectations against outlier scenarios such as early monsoon activity or unusual atmospheric blocking patterns.

From a regulatory standpoint, this market's accessibility depends on jurisdiction. Under German GlüStV rules, prediction markets require licensing; US CFTC oversight applies to derivatives on weather indices, though binary weather outcomes occupy a grey zone. Platforms offering no-KYC access up to $1,500 notional value typically operate under exemptions for small-stake prediction contracts, meaning traders in certain regions may participate without identity verification below that threshold. Traders should verify their local regulatory status before engaging, as CFTC reach extends to US persons regardless of platform location.

Methodology

This overview of Highest temperature in Guangzhou 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 Is Kalshi Legal in California?

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.

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 Kalshi Legal in California 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 Kalshi Legal in California exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.

What if regulation changes?

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