Highest temperature in Milan on July 31?

Platform comparison

Market context

Milan’s high on 31 July will be set by the maximum observed at Malpensa Airport, not by city-centre conditions, so the key question is whether the airfield sees a late-day spike or a more muted profile under the same regional pattern. July is normally Milan’s hottest month, with average highs around 29-30°C, but recent extremes show the city can move far beyond that in heatwave conditions: Reuters reported Milan’s hottest day since 1763 in August 2023, while another source says the city reached 40°C on 30 July 2026.[19][1]

That background makes a 0% crowd-implied yes price difficult to read as a pure weather view; it can also reflect settlement mechanics, thin participation, or a market that is badly mispriced relative to the contract’s range structure. On the available climatology, July outcomes in Milan are usually clustered near the high-20s to low-30s °C, with record highs in the upper 30s and occasional low-40s outliers in exceptional heat.[7][8][10]

For traders, the main catalysts are the same-day forecast updates, any heat advisories over northern Italy, and whether Milan sits under a strong subtropical ridge or a thunderstorm breakdown that caps the afternoon maximum. Because settlement uses Wunderground’s history page for LIMC and closes at 12:00 UTC, the market is exposed to the pre-noon temperature path rather than the full local afternoon, so any warm early surge, cloud cover, or rain timing matters more than the day’s headline forecast alone.[4] On-chain flow is secondary here, but the 0% level suggests either very little liquidity or a large mismatch between the book and the weather odds, which is the main microstructure feature to watch.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

How volatile are crypto prediction markets?

Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.

Which crypto markets exist on Polymarket?

Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.