Shanghai experiences highly variable weather during late April as spring transitions establish across eastern China. The city typically sees temperatures ranging from 15–22°C during this period, making precise temperature targets meaningful for forecast verification. This market resolves at the close of April 20, 2026, based on the highest recorded temperature in Shanghai that calendar day, sourced from official meteorological data. The current YES odds of 1% reflect strong trader conviction that this outcome is extremely unlikely. This reflects both the narrow precision required—hitting exactly 15°C—and typical April weather patterns where temperatures frequently exceed or fall below this specific threshold. The resolution is binary: either Shanghai's peak temperature on April 20 reaches 15°C or it does not. Early market activity shows sustained conviction against YES, with odds remaining well below 2% throughout trading. This daily recurring weather market provides insight into how prediction markets price precise meteorological events. Current forecasts from major meteorological sources suggest Shanghai's high on April 20 will likely range between 16–20°C, which would resolve this market to NO.