Highest temperature in Wellington on July 1?

Platform comparison

Market context

Wellington, New Zealand, experiences cool winter conditions in July, with average daily highs typically ranging between 12°C and 15°C at the Wellington International Airport. The current crowd-implied probability of 0% for a “YES” outcome reflects the near-certainty that temperatures will not reach the upper threshold required to trigger the contract, given the region’s seasonal climate patterns.

Historical data from NIWA confirms that Wellington’s all-time maximum temperature reached 30.3°C at Kelburn, but this occurred during an extreme summer heatwave, not in July. July records for the airport station show no instances exceeding 20°C, and Stats NZ indicates that warm days above 25°C are exceptionally rare in winter months across New Zealand’s southern latitudes[2][4].

Traders should monitor upcoming weather forecasts from the National Institute of Water and Atmospheric Research (NIWA) for any anomalous heatwave announcements, though such events are historically confined to summer. No scheduled climate interventions or unusual atmospheric dependencies are expected to alter winter temperature baselines in Wellington before the settlement window closes on 1 July 2026[2].

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

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 Kalshi 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.

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.

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.