Highest temperature in Wellington on July 1?

Platform comparison

Market context

Wellington, New Zealand, experiences its coldest month in July, with average highs hovering around 12°C and lows near 7°C, making a temperature spike to extreme levels virtually impossible. The current crowd-implied probability of 0% YES on Polymarket reflects this stark climatic reality, where the contract on the Polygon network, settled in USDC via conditional tokens, correctly prices the near-zero chance of a record-breaking heat event. Historical data from NIWA confirms that Wellington (Kelburn) only recently reached its all-time maximum of 30.3°C during a rare heatwave, a figure that remains an outlier in a month defined by southerly winds and cool air [1].

Traders should monitor the National Institute of Water and Atmospheric Research (NIWA) for any unusual heatwave announcements, though July schedules consistently show minimal thermal volatility. The primary dependency is the persistent southerly flow, which historically suppresses temperatures, as evidenced by the 37.1 m/s southerly gust recorded in June 2013 that brought cold air to the region [7]. Recent climate reports indicate that July averages remain stable, with no catalysts suggesting a deviation from the norm, reinforcing the market’s 0% pricing as a rational assessment of on-chain risk [5]. The resolution source, Wunderground, will capture this expected coolness, ensuring the contract resolves against the YES condition.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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.

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 PolyGram 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.