Milan, Italy's major financial and cultural center in the Lombardy region of northern Italy, experiences variable spring weather conditions during mid-April. This prediction market tracks whether the daily high temperature will reach exactly 21°C on April 18, 2026. The question is precisely and objectively resolvable using official meteorological data from Italy's national weather service or well-established local weather stations serving the Milan region. Currently trading at 1% YES odds, the market reflects the inherently low probability of any weather outcome landing on a precise whole-degree target. Historical temperature data for April in Milan typically shows daily highs ranging from 12°C to 22°C, making 21°C a temperature that falls well within the normal seasonal range—yet hitting it exactly remains difficult to predict. The extremely low price at 1% reflects the market's assessment that significant uncertainty surrounds achieving this exact threshold, as even single-degree deviations would result in a NO resolution. Weather prediction markets maintain high liquidity in the broader prediction market ecosystem due to the transparent and independently verifiable nature of meteorological data. The market expires at midnight UTC on April 18, with resolution based on official records.