Highest temperature in Shanghai on July 25?

Platform comparison

Market context

Shanghai's climate on 25 July will reflect the city's peak summer conditions, with historical records showing temperatures consistently exceeding 35°C during late July. The settlement mechanism resolves via Wunderground's historical data feed from Shanghai Pudong International Airport, the official meteorological station, with USDC settlement occurring post-12:00 UTC on the resolution date. The 0% crowd probability reflects either extreme confidence in a specific temperature band or minimal trading activity; given Shanghai's reliable summer heat patterns, traders should calibrate expectations against the full range of possible outcomes rather than treating the current odds as predictive.

July represents Shanghai's hottest month, with 30-year climate normals placing the average high near 32°C and extreme highs regularly reaching 37–39°C. The 2013 heat wave produced a 40.8°C reading; more recently, July 2022 saw multiple days above 38°C. These precedents establish the baseline distribution: outcomes clustering around 35–37°C carry the strongest historical weight, whilst readings below 33°C or above 40°C remain plausible but less frequent. The settlement window's noon UTC cutoff aligns with afternoon peak temperatures, maximising the likelihood of capturing the day's true maximum.

Traders monitoring this contract should track China Meteorological Administration forecasts released in early July, which typically provide 10-day outlooks with reasonable accuracy for major cities. Urban heat island effects around Pudong's airport vicinity and any unusual atmospheric patterns—monsoon timing shifts or high-pressure system positioning—will influence outcomes. Real-time weather data from competing sources (AccuWeather, local Shanghai forecasts) can serve as cross-checks against Wunderground's eventual settlement reading, though discrepancies between stations remain rare for daily extremes at major airports.

Methodology

This page reads Highest temperature in Shanghai on July 25? 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.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

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.

Are crypto prediction markets taxable in the US?

In the US, prediction market gains are typically treated as ordinary income or short-term capital gains depending on holding period. Consult a tax professional for your specific situation — we cannot provide tax advice.