Highest temperature in Paris on May 22?

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Market context

Paris-Le Bourget Airport’s hottest reading on 22 May is being priced as a complete underdog, with the market implying 0% for a yes outcome. The consensus is effectively that the day’s high will land in the lower-to-mid 20s Celsius rather than the upper 20s or above. That leaves little room for a hot-day surprise unless the afternoon warms more sharply than expected; in handicap terms, the market is leaning hard against the top end of the distribution.

Seasonally, late May in Paris is usually mild to pleasantly warm, not notably hot. Long-run climate normals put May highs around 20°C, with typical daily highs in the high teens to low 20s and only occasional spikes well into the upper 20s. Recent comparable markets also point to that same profile: the Paris high on 21 May was effectively treated as locked in around 24°C, while the 22 May market has a broader spread but still centres on moderate warmth rather than heat. The value question is whether a short, sunny afternoon and light winds can push the airport reading into an uncommon top-end outcome.

For traders, the main catalysts are the morning forecast updates and any shift in cloud cover, wind direction, or convective shower risk over north-east Paris. The settlement source is the Paris-Le Bourget Airport Station, so a city-centre forecast is only a guide if the airport sits in a warmer or cooler pocket. AccuWeather’s Paris outlook for late May has been showing highs in the mid-20s Celsius range, which is enough to keep the favourite in control but still leaves a contrarian tail if conditions over the airport run hotter than the broader city forecast.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.

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.