Highest temperature in Wellington on July 16?

Platform comparison

Market context

The market tracks the peak temperature recorded at Wellington International Airport on 16 July 2026, resolving to the specific Celsius range containing that daily maximum. Programmatic traders typically scrape Wunderground’s historical daily endpoint for NZWN to automate settlement verification, treating the 0% current crowd-implied probability on the leading outlier as a signal to back-test historical mid-July baselines rather than chase the consensus.

Historical mid-July data for Wellington shows peak temperatures consistently clustering between 14°C and 17°C, with 15°C appearing as the statistical median in recent years. The current frontrunner outcome of 15°C holds a 53% implied probability, while 16°C sits at 44%, suggesting the market is pricing a narrow, typical winter day rather than an anomaly [1]. A 0% probability on any extreme low or high range indicates the crowd has already filtered out statistically improbable outliers, leaving only the core distribution for algorithmic entry.

Traders should monitor the National Institute of Water and Atmospheric Research (NIWA) daily weather summaries for any unexpected southerly wind shifts or cloud cover anomalies that could depress temperatures below the 14°C floor. While no specific announcement is scheduled for this date, the settlement dependency on Wunderground’s 24-hour rolling maximum means traders must verify the station’s data feed integrity before the 12:00 UTC cutoff to ensure the automated resolution script captures the true peak [2].

Sources: 1 · 2

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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 Polymarket Review UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.