Wellington enters its autumn season in May, with typical highs ranging between 12–16°C depending on prevailing winds and frontal systems. The prediction market for a high of exactly 11°C currently prices at 0%, reflecting trader consensus that this specific threshold is unlikely on May 17. The high specificity of the resolution criterion—not "11°C or below" but precisely 11°C—narrows the probability substantially. Historical meteorological data for Wellington shows temperature distribution on May days clusters around the 13–14°C range. The current market structure implies traders expect either warmer conditions (driven by a brief high-pressure system) or cooler-but-not-as-low conditions. Recent weather patterns in the region have favored mild autumn days, which would push the likely high above 11°C. No significant cold snap is indicated in the forecast outlook. The odds trajectory has remained at zero for the past 24 hours, suggesting stable trader conviction that 11°C highs are not credible for this date.
What factors could move this market?
Wellington, the capital of New Zealand, sits on the Cook Strait's western edge, making it one of the country's windiest and most temperamentally variable cities. In May, the Southern Hemisphere enters full autumn, and Wellington's weather begins a gradual transition toward cooler winter patterns, though the city rarely experiences the deep freezes of southern regions. Historical temperature records for mid-May in Wellington show that highs of 11°C are rare but possible, typically occurring only during the passage of a cold southwesterly front or in the immediate aftermath of an Antarctic cold-air incursion. Most May days see highs between 12 and 16°C, with 14°C being near the climatological median.
For this market to resolve YES, Wellington would need to experience a day where the maximum temperature reaches exactly 11°C—a narrow window that requires precise atmospheric conditions. The factors supporting an 11°C high would include a strong cold front tracking northeastward across the North Island, sustained southwesterly winds channeling Antarctic air masses, or prolonged cloud cover suppressing solar heating. Conversely, factors opposing YES resolution are more numerous: typical May antecyclone patterns bring northeasterly winds and relatively mild conditions; Wellington's maritime influence (surrounded by Cook Strait waters) moderates extreme cooling; and the current meteorological setup shows no organized cold system scheduled for May 17. The Southern Oscillation and regional pressure patterns favor near-normal to above-normal temperatures across New Zealand.
The 0% odds reflect the market's interpretation that a precisely 11°C high is not credible given the current forecast environment and historical distribution. Hitting exactly 11°C requires either a very specific weather event or precise timing of daily heating cycles. Recent analogous conditions in Wellington show that on days with cold fronts, highs have typically ranged 9–12°C, suggesting some historical precedent; however, 24-hour probability would only drift upward if medium-range forecast models shift toward a genuine cold signal. Currently, traders appear fully confident this is not the day.
What are traders watching for?
Official maximum temperature reading from NIWA's Wellington meteorological station on May 17 2026 determines final market resolution.
Southwesterly wind intensity and direction May 17; stronger sustained winds likely cool the air mass and lower the daily high.
Overnight minimum and morning cloud cover on May 17; persistent cloud suppresses solar heating and keeps daily maximum lower.
Position of cold front relative to New Zealand; a front tracking across Wellington introduces cold air mass on the day.
How does this market resolve?
The market resolves based on the official maximum temperature recorded in Wellington on May 17, 2026, as published by New Zealand's meteorological authority (NIWA), with resolution occurring at 00:00 UTC on May 18, 2026.
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