Wellington’s May 11 High: Will Twelve Degrees Hold?

Wellington’s weather markets rarely move this fast. The contract pricing the city’s highest temperature on May 11 at 12°C has surged nearly 28 percent in both the last hour and the last 24 hours, pushing the implied probability to 77.5 percent. That kind of momentum in a short-horizon weather market means traders are converging on a single forecast signal, not debating it.

The 12°C outcome is the market leader. Wellington sits at 41 degrees south latitude, and early May marks the transition into autumn. Average daily highs in Wellington during May typically range between 12°C and 14°C, with marine airflow keeping extremes rare in either direction. The market is currently pricing 12°C as the most likely single-degree outcome for May 11, with the next closest alternatives sitting well below this contract’s 77.5 percent implied probability.

How the Wellington Temperature Contract Works

This contract resolves YES if the official highest temperature recorded in Wellington on May 11, 2026 falls within the 12°C outcome band. Resolution is based on official meteorological measurement for that calendar day, closing at 2026-05-11 12:00:00. The resolution source is the market operator’s designated data feed.

• YES (12°C outcome): Priced at 0.78, implying 77.5% probability.
• NO (any other outcome, including 11°C, 13°C, 14°C, 15°C, 16°C or higher, 10°C, 9°C, 8°C, 7°C, 6°C or below): Priced at 0.23, implying 22.5% probability.

The 22.5 percent on the NO side reflects real meteorological range. Wellington’s autumn weather is shaped by the Cook Strait, which moderates temperatures but also channels strong southerlies. A cold front pushing in from the south could drag the daily maximum below 12°C, landing the outcome in the 11°C or lower bands. A warmer northerly flow could push the high toward 13°C or 14°C. The market is saying neither of those scenarios is likely, but both are plausible enough to keep the NO price alive.

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Momentum and Market Signals

The composite momentum signal here is striking. The 1-hour change of +28.0 percent, the 24-hour change of +28.5 percent, and a trend score of 85.81 are all pointing the same direction at the same time. That alignment almost always traces to a specific catalyst. For a 24-hour weather market, the most likely driver is a weather model update or a new forecast publication from MetService, New Zealand’s national meteorological service. When NWP models align on a specific temperature ceiling, short-horizon contracts reprice sharply.

Total volume on this contract sits at $43,705, with $31,628 of that trading in the last 24 hours. Liquidity is listed at $322,604. The volume figure is well below $1 million, which matters: thin liquidity means a single large order can move this price sharply. The 28 percent surge could reflect genuine forecast convergence, or it could reflect a modest-sized trade hitting a relatively thin book. Traders should weigh that when reading the current probability as a precise signal.

• The 1h and 24h price changes (+28.0%, +28.5%) arrived together, suggesting a single catalyst rather than gradual drift. MetService or a global model update is the most probable source.
• Wellington’s autumn daily maximum climatology centers near 12-13°C in early May, giving the 12°C outcome a natural climatological base rate advantage.
• The trend score of 85.81 confirms momentum is not random noise. It reflects sustained directional buying pressure over the measurement window.
• 24h volume of $31,628 against $322,604 in liquidity means this market is lightly traded relative to its book depth. Price can move on small orders.
• NO contracts covering 11°C and below represent the cold-side risk. A southerly outbreak through Cook Strait is the primary meteorological scenario that would push the high below 12°C.

Lines Analysis: Wellington on May 11

MetService forecasts for Wellington on May 11 are the single most important input here. Wellington’s temperature profile in early May is well-constrained by its coastal geography. The city rarely sees daily highs above 15°C or below 9°C in this period. The 12°C band sits near the lower end of the typical range, which means a mild autumn day with any northerly influence would overshoot it toward 13°C or 14°C. The market’s 77.5 percent on 12°C implies traders believe the forecast is pointing at a cool, likely southerly-influenced day.

The genuine risk for the NO side lives in two directions. A stronger southerly than forecast could hold the maximum below 12°C, landing the outcome at 11°C or lower. A warmer day than forecast, with northerly flow, could push the high to 13°C or 14°C. Both of those scenarios are covered by NO contracts at different price bands. The combined NO probability of 22.5 percent is not trivial for a 24-hour weather outcome this close to resolution.

• MetService’s official forecast for Wellington on May 11 is the primary signal to watch. Any revision toward a warmer or colder outlook would reprice this contract immediately.
• GFS and ECMWF model agreement on Wellington’s May 11 temperature profile would reinforce the 12°C outcome. Model divergence would widen uncertainty and pressure the YES price lower.
• Cook Strait southerly index is the key meteorological variable. A cold front arrival before noon on May 11 is the clearest path to a sub-12°C outcome.
• Synoptic charts for the Tasman Sea and Southern Ocean should be monitored for any late-developing systems that could arrive faster than current model runs suggest.

The $43,705 in total volume is thin for a market this close to resolution. Here’s what the measurements are telling us: the data favors the 12°C outcome based on current forecast alignment, but the market is pricing uncertainty, not science. A single MetService update before the 2026-05-11 12:00:00 close could move this price materially in either direction.

LINES VERDICT

Forecast Convergence, Thin Book

The market has priced Wellington’s May 11 high at 12°C with strong conviction, driven by a sharp momentum surge that almost certainly traces to a recent forecast update. The data doesn’t care about the politics, and right now the meteorological data is pointing at a cool autumn day in Wellington.

What the market says: 77.5 percent probability on the 12°C outcome, reflecting strong recent momentum and forecast alignment. With resolution at 2026-05-11 12:00:00 less than 24 hours away, this probability is highly sensitive to any last-minute forecast revision. Thin volume means the price can move sharply on a single trade or data update.

Key unknown: The next MetService forecast update for Wellington on May 11 is the single most important input. Any shift in the predicted daily maximum, up or down by even one degree, would reprice this contract significantly before the resolution window closes.

Scientific Context: Wellington’s Autumn Temperature Profile

Wellington’s climate in early May is governed by its exposure to Cook Strait and the prevailing westerly wind belt. Daily maximum temperatures in May average between 12°C and 13°C, based on long-run NIWA climatological records. The 12°C outcome band sits right at the lower edge of that typical range, consistent with a day dominated by southerly airflow or cloud cover suppressing daytime warming. The 13°C and 14°C bands represent more neutral to northerly conditions. The market’s current pricing reflects a forecast pointing toward the cooler end of Wellington’s normal May range, not an extreme in either direction.

Frequently Asked Questions

• What does 77.5 percent mean here? It means the market currently assigns a 77.5 percent chance that Wellington’s official highest temperature on May 11 will land in the 12°C outcome band. Probabilities shift as new forecast data arrives.
• What pays out on NO? Any outcome other than 12°C resolves the NO contracts. That includes 11°C, 13°C, 14°C, 15°C, 16°C or higher, and all bands at 10°C and below.
• What would move this price before resolution? A MetService forecast revision for Wellington on May 11, or a significant shift in global weather model output, is the primary catalyst. Model agreement on 13°C or higher would push YES lower fast.
• When does this contract resolve? The resolution date is 2026-05-11 12:00:00. The outcome is based on official meteorological temperature data for Wellington on that date.
• Is the volume reliable? Total volume of $43,705 is thin. Liquidity of $322,604 is relatively deep, but low trading volume means the current price can shift sharply on a single order or new data release.

This analysis reflects market conditions as of 2026-05-10 19:10:23. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-11 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.