Highest temperature in Wellington on August 8?

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Market context

Wellington’s temperature on 8 August will be set by the day’s highest reading at Wellington International Airport, with the market resolving from Weather Underground’s Daily Observations table rather than the summary high/low banner. August is usually one of Wellington’s coolest months: long-run climate normals put average August highs around 12–13.6°C, with lows near 4–9°C, so outcomes in the low teens are the statistical centre of gravity rather than an outlier.[1][3][10][19]

That is why the current 0% crowd-implied YES looks anchored to the lower end of the distribution, not to a genuine zero-temperature expectation. Comparable August records across Wellington sources show the month is usually stable but can still produce warmer spells, with historical highs in the mid-teens and occasional spikes above 15°C in past years; however, those warmer days are less common than the more typical 11–13°C range.[1][5][8][11] For a settlement band tied to the day’s maximum, traders generally focus on whether the station gets a brief northerly or a sunnier afternoon that lifts the peak above the usual August norm.[9][19]

The main catalysts today are the airport observations themselves: early morning cloud, wind, and any forecast improvement through the afternoon. Forecast products for Wellington currently show mild August conditions, with daily highs in the 53°–60°F range and lows around 45°–51°F, which translates to a roughly 12–16°C envelope and leaves the exact settlement band dependent on whether the day tops out near the lower or upper end of that range.[15] Because the market uses the Daily Observations table, the final print can differ from the headline high/low summary, so traders should watch the station’s recorded peak rather than the broad daily recap.[16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

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