Highest temperature in Wellington on July 1?

Platform comparison

Market context

Wellington experiences its coldest month in July, with typical highs around 13°C and lows near 7°C, making a temperature spike above 20°C highly improbable on 1 July 2026. This stark seasonal reality underpins the current crowd-implied probability of 0% YES for any elevated temperature range, as the city’s winter climate firmly suppresses thermal extremes during this period.

Historical data reinforces this baseline: Wellington (Kelburn) recently hit its all-time maximum of 30.3°C on a heatwave day, but such events are rare and never occur in early July, which remains the coldest month of the year with average highs of just 53°F (11.7°C) [1][4]. The 1 July 1995 record low of −8.6°C in Lincoln, Canterbury, further illustrates how southern New Zealand plunges in winter, with no credible precedent for high July temperatures in Wellington’s coastal zone [6].

Traders should monitor NIWA’s seasonal forecasts and any unexpected southerly wind shifts, though these typically bring colder air rather than warmth [5]. Recent heatwave reports from NIWA confirm that extreme warmth in New Zealand is confined to summer months, with no scheduled announcements suggesting anomalous winter warming [1]. On-chain, this contract trades on Polygon using USDC, with conditional tokens reflecting the near-zero likelihood of a temperature breach, as the settlement window closes on 1 July 2026 at 12:00 UTC.

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 Polymarket Legit?. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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.