Seoul experiences significant temperature variability throughout spring as the season transitions between winter's lingering coolness and approaching summer warmth. April 18 marks mid-spring in Seoul, with typical daily highs ranging from 15 to 20°C. The market specifically predicts whether Seoul's highest temperature on that date will be exactly 12°C—a notably cooler outcome compared to the seasonal average. Current 0% YES odds reflect trader consensus that this precise temperature target is highly unlikely to occur. Prediction markets with specific-degree requirements face inherent challenges, as weather systems rarely produce exact temperature hits; most market activity focuses on temperature ranges rather than single-degree targets. The 12°C threshold falls below Seoul's expected April range, reducing probability compared to higher temperature scenarios. Early market activity shows consistent skepticism with no upward price movement, indicating traders believe normal spring weather patterns make this outcome improbable. The combination of seasonal temperature expectations and the specificity requirement creates challenging odds for resolution in the YES direction. Market resolution will be determined by official high temperature data from Seoul's primary weather station on April 18, 2026.