Shanghai experiences variable spring weather in mid-April, with daily highs typically ranging from 18°C to 24°C depending on prevailing air masses and synoptic weather patterns. This market tracks whether the highest temperature recorded in Shanghai on April 20 will be exactly 19°C—a precise outcome requiring both that the temperature reach this specific value and that no higher readings occur throughout the day. The 21% odds suggest traders view this exact outcome as unlikely, reflecting the natural variance in daily temperature ranges across the city. April represents a transition period between spring and early summer in Shanghai, when both continental and maritime air masses influence conditions. Resolution is straightforward: official temperature data from the Shanghai Meteorological Bureau will determine whether the daily maximum equals 19°C. The odds have remained relatively stable, indicating modest conviction in either direction among traders. Daily weather markets like this appeal to weather enthusiasts and meteorology followers, providing a venue for precise weather predictions within a 24-hour window. These markets demonstrate how specific meteorological outcomes can be tradeable events with clear, verifiable endpoints.