This market tracks whether Chicago's highest temperature on April 20, 2026 will fall precisely within the narrow range of 70-71°F. Daily temperature markets resolve based on official National Weather Service readings from weather stations in the Chicago metropolitan area. The current YES odds of 0% reflect how unlikely this specific outcome has become—this one-degree range sits well above Chicago's typical April highs of 45-65°F, outside the normal seasonal window. When predicted outcomes drift significantly far from historical climate patterns and seasonal norms, odds naturally compress toward zero as market participants and forecasters recognize the minimal underlying probability. Throughout the trading day, market participants can trade as updated weather forecasts emerge and preliminary atmospheric conditions develop, though liquidity for such narrow, specific windows typically remains modest compared to broader outcome markets. The resolution happens automatically when the National Weather Service publishes its official daily maximum temperature reading after midnight each day. These specialized daily temperature prediction markets appeal to weather enthusiasts, climate researchers, and data-driven traders seeking direct exposure to granular atmospheric predictions. They offer a structured, transparent way to make prediction market trades on specific, measurable weather events that resolve with scientific precision and objectivity.