Highest temperature in Chongqing on July 17?

Platform comparison

Market context

Chongqing’s July heat has surged unexpectedly in the last 48 hours, with humidity climbing to 89% and temperatures holding near 79°F overnight at Jiangbei International Airport, contradicting the market’s 0% YES probability for any extreme heat outcome [2]. This damp, sticky baseline aligns with the city’s typical July pattern: average highs of 33°C (91°F) and frequent heavy thunderstorms that usually cap peak temperatures [10]. Historical data confirms July is Chongqing’s hottest month, yet the 0% pricing ignores the 21% crowd-implied chance for 34°C and 20% for 33°C, suggesting traders are underweighting the region’s volatile heat spikes despite consistent 33–34°C records in recent years [4][11].

Traders should monitor the 70% precipitation probability forecast for Friday (July 17) and the moderate-to-strong southerly winds expected to intensify by afternoon, as these factors could suppress or amplify peak temperatures [6][7]. The resolution hinges on Wunderground’s recorded high for ZUCK at 12:00Z on July 17, so any sudden shift in cloud cover or rain timing—particularly the 35% morning rain chance turning to 70% by evening—will directly impact the outcome [6]. AccuWeather’s current forecast shows a RealFeel of 59–60°F with poor air quality, but the 14-day outlook indicates a sharp rise in precipitation risk that could either cool the day or trap heat if clouds clear prematurely [5][6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Today trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.