Seoul experiences moderate spring temperatures in mid-April, with average highs around 15-18°C. This prediction market asks whether the daily maximum will be precisely 20°C on April 18, 2026—a specific and measurable outcome resolved using official weather service data from the Korea Meteorological Administration. The current market odds of 16% YES reflect skepticism about hitting this exact threshold, as most traders recognize that weather patterns produce continuous temperature ranges rather than neat integer values. April weather in Seoul is typically transitional, balancing cooler mornings with warming afternoons as spring progresses toward early summer. A 20°C maximum would represent a moderately warm day for mid-April but remains within typical seasonal bounds. The 16% pricing implies traders view a precisely 20°C day as less likely than other temperature outcomes like 19°C, 21°C, or broader ranges such as 18-22°C. Recent market activity demonstrates steady trading volume, reflecting sustained interest in daily temperature predictions for Seoul. The odds trajectory has remained relatively stable, indicating traders have reached consensus that the precise 20°C threshold is unlikely but plausible within the seasonal range.