Madrid's weather on April 20 represents a daily temperature ceiling prediction. The market question asks whether the highest temperature in Madrid will remain at or below 21°C on that date. With current YES odds at 0%, market participants show strong conviction that the maximum temperature will exceed this threshold. Mid-April in Madrid typically experiences spring warming, with historical average highs around 19-20°C, though daily variations are common based on broader European weather patterns. The resolution depends on official meteorological readings from Spain's national weather service (AEMET) or equivalent authority measurements of Madrid's maximum temperature for April 20. The 0% YES odds suggest market forecasters expect either above-average warmth or weather conditions pushing temperatures above the 21°C mark—a signal that traders believe cooler spring conditions are unlikely on this specific date. This is part of a recurring daily temperature prediction series active across multiple European cities. Markets like these rely on transparent, publicly available temperature data for resolution, making them straightforward to settle. The current liquidity of $11,050 enables continuous trading right up to the resolution deadline.