Paris Low Temp May 10: Will It Hit Twelve Degrees?

Two days out from resolution, the Paris minimum temperature market for May 10 sits at a modest 26.5% probability for a 12°C low. The market is pricing uncertainty, not science. Numerical weather prediction models are already producing high-confidence output for a forecast window this close, and the spread across competing temperature outcomes tells the real story: traders are not converged on a single number, and thin liquidity means one decent-sized bet can move this contract sharply.

The contract resolves at 2026-05-10 12:00:00. Total traded volume sits at $1,349, and order book depth registers $15,415. That volume figure is all 24-hour activity, which means this market has essentially lived and breathed in a single session. With open interest at zero and volume this light, the 26.5% YES price reflects a thin consensus, not a well-tested crowd signal.

How the Paris May 10 Temperature Contract Works

This contract asks a single question: will the lowest recorded temperature in Paris on May 10 equal exactly 12°C? Polymarket resolves this against official meteorological data for Paris on that date. The resolution window closes at 2026-05-10 12:00:00. Competing outcomes include 13°C, 11°C, 10°C, 14°C, 15°C, 9°C, 8°C, 7°C or below, 16°C, and 17°C or higher, meaning capital is spread across a wide temperature band.

• YES (12°C low): priced at 0.27, implying 26.5% probability.
• NO (any other outcome): priced at 0.74, implying 73.5% probability.

A NO payout requires the Paris minimum to land anywhere other than 12°C. That is a wide target. Paris in early May typically records overnight lows ranging from roughly 8°C to 15°C depending on synoptic conditions, so the distribution of outcomes is genuinely spread. The 12°C bucket wins only if the official minimum lands precisely on that value, not 11.5°C rounded up or 12.4°C rounded down. Resolution precision matters here.

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Momentum and Market Signals

The momentum composite for this contract reads flat. The 1-hour change is zero, 24-hour data is unavailable as a standalone figure, and the trend score of 38.23 points to mild bearish lean without any identifiable catalyst driving it. The most likely driver of any price movement between now and resolution is a weather model update, specifically the European Centre for Medium-Range Weather Forecasts output or the Global Forecast System run showing a tighter temperature band for Paris overnight May 9 into May 10.

Total volume of $1,349 is thin by any standard. The $15,415 in order book depth is not a sign of confidence. It means the spread is wide enough to absorb a few hundred dollars without slipping badly, but a single trader committing $500 to any outcome bucket could move the implied probability by several percentage points. Flag this: volume below $1M means price signals here reflect a small number of participants, not a mature crowd estimate.

Key Factors

• The 1-hour price change of +0.0% combined with a trend score of 38.23 signals no fresh catalyst has entered the market in the last session.
• Paris overnight lows in early May cluster between 9°C and 14°C in recent climatological records, making 12°C a plausible but not dominant single outcome.
• Related city markets for May 8 have resolved at or near 99-100%, suggesting the broader temperature market infrastructure is functioning and resolution is reliable.
• Zero open interest alongside a $1,349 volume figure means most positions opened and closed within the same session, leaving little committed capital heading into resolution.
• The 24-hour price change being unavailable as a separate signal limits momentum interpretation. The flat hourly reading is the only confirmed directional data point.

Lines Analysis: What the Paris Temperature Data Says

Here is what the measurements are telling us. May 10 in Paris falls in a shoulder season window where Atlantic low-pressure systems and continental anticyclones compete. The climatological mean minimum for Paris in the first two weeks of May sits around 9°C to 11°C, with warmer anomalies possible when high pressure dominates from the south. A 12°C low is above the long-run average minimum, which means the market is essentially betting on a mild night, not a cold snap.

The barrier for NO is actually the entire rest of the distribution. Outcomes below 12°C, specifically 11°C, 10°C, 9°C, and below, carry collective implied probability that likely exceeds the 12°C bucket on its own. The same is true above: 13°C and 14°C outcomes hold meaningful probability if a southerly flow pattern delivers warmer air overnight. The data doesn’t care about the politics of which bucket traders prefer. It cares about atmospheric dynamics on a specific date, and those dynamics are now within deterministic forecast range.

Signals to Monitor

• European Centre for Medium-Range Weather Forecasts 48-hour temperature forecast for Paris: a shift toward 13°C or 11°C minimums would compress the 12°C bucket probability.
• Global Forecast System evening run on May 9: the final model cycle before resolution is the highest-value data point available.
• MeteoFrance official forecast update: France’s national weather service produces location-specific minimum temperature guidance that often aligns closely with resolution data sources.
• Synoptic pattern shift: any late trough passage over northern France on May 9 evening would push minimums lower, favoring sub-12°C outcomes.
• Trading volume spike: a sudden increase in volume on any competing bucket, particularly 11°C or 13°C, would signal informed traders repositioning on fresh model data.

Total volume of $1,349 means this market has not attracted the kind of capital that typically signals high trader confidence. The 12°C bucket at 26.5% is a reasonable prior given the climatological distribution, but the data favors no single outcome strongly at this stage. Resolution is 48 hours out, and the forecast models will tighten considerably before then.

LINES VERDICT

Outcome Uncertain: Distribution Spread Across Multiple Buckets

The 12°C bucket holds a plausible but not dominant share of the temperature probability distribution for Paris on May 10. Climatology and atmospheric dynamics support a range of outcomes from 9°C to 14°C, and no single bucket commands a majority of the forecast probability at this range.

What the market says: At 26.5%, traders assign the 12°C low roughly one-in-four odds. That is a thin plurality in a field of eleven outcomes, and with volume below $1,000 before today, the price is fragile and can move sharply on any fresh model update before 2026-05-10 12:00:00.

Key unknown: The MeteoFrance operational forecast and the final European Centre for Medium-Range Weather Forecasts model run on May 9 will be the decisive data points. A clear model consensus on 11°C or 13°C would reprice this contract significantly in the final hours before resolution.

Scientific Context

Paris minimum temperatures in early May show meaningful interannual variability. The city’s urban heat island effect tends to elevate overnight lows by 1°C to 2°C relative to rural surrounding areas, which can matter when official station data is used for resolution. If the resolution source draws from a central Paris station rather than a suburban or airport site, the urban bias slightly favors warmer minimum outcomes. A 12°C reading would represent a mild May night, consistent with conditions under weak high pressure or a slow-moving warm front.

Before 2026-05-10 12:00:00, the events most likely to move this contract are the May 9 evening forecast model runs and any MeteoFrance official bulletin updating the overnight minimum guidance for central Paris. Traders watching this market should track those outputs directly rather than relying on price movement as a leading indicator, given the thin liquidity.

Frequently Asked Questions

• What does 26.5% probability mean here? It means the market assigns roughly a one-in-four chance that Paris records exactly 12°C as its lowest temperature on May 10. It does not mean the outcome is likely, only that it is the single most-traded bucket in a wide field.
• What pays out on the NO side? Any official Paris minimum temperature other than 12°C on May 10 resolves this contract as NO. The NO position covers ten competing temperature outcomes, giving it a structural probability advantage of 73.5%.
• What data or event would move the price most? A European Centre for Medium-Range Weather Forecasts or MeteoFrance forecast update narrowing the May 10 Paris minimum to a specific value would reprice all competing buckets. Model consensus on 11°C or 13°C would pull capital away from the 12°C outcome.
• When does this market resolve? Resolution occurs at 2026-05-10 12:00:00, based on official meteorological data for Paris on that date.
• Is the volume reliable enough to trust the price? Total volume of $1,349 is very thin. The $15,415 in order book depth provides some cushion, but a single trade of a few hundred dollars can move the implied probability by several points. Treat the 26.5% figure as a rough prior, not a crowd-tested consensus.

This analysis reflects market conditions as of 2026-05-08 06:37:54. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-10 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.