Highest temperature in Wellington on July 16?

Platform comparison

Market context

The market hinges on the peak Celsius reading at Wellington International Airport on 16 July 2026, a date deep in New Zealand’s midwinter when temperatures typically hover near freezing. With the crowd-implied probability at 0% YES, the consensus suggests the temperature will fall outside the specific range defined for a “YES” outcome, likely reflecting expectations of standard winter lows rather than an anomalous heat spike.

Historical data for Wellington in mid-July shows maximum temperatures rarely exceeding 15°C, with frequent days dipping below 10°C; a 0% probability aligns with this pattern unless a rare southern oscillation or coastal warming event occurs. Programmatic traders should back-test Wunderground’s NZWN station history for July 16 across the past decade to calibrate conditional order thresholds, treating the current 0% as a baseline for mean-reversion strategies rather than an absolute forecast.

Key catalysts include the Bureau of Meteorology’s weekly synoptic charts for the Tasman Sea and any sudden shifts in the Southern Annular Mode, which can trigger unseasonal warmth. Traders monitoring this market programmatically should set alerts for NOAA’s real-time updates on NZWN and cross-reference with MetService NZ’s midwinter forecasts, as a single unanticipated warm front could invalidate the 0% assumption before the 2026-07-16T12:00:00Z settlement window closes.

Sources: 1

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

Do I need to KYC for this market?

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

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.