The title asks for Seoul's highest temperature, but the rules explicitly mandate using data from the Incheon Intl Airport Station. Since Incheon and central Seoul can have temperature differences, and data is rounded to whole degrees Celsius, traders who do not read the rules carefully face a significant risk of misjudgment.

Weather forecasts consistently indicate that the high temperature in Seattle on April 30 will reach 66-72°F, which clearly falls into the '64°F or higher' range [2, 5, 8]. However, the implied probability in the prediction market for this option is only 54.5%. This divergence is likely due to some traders relying on earlier, cooler weather trends or not having updated forecast information. As the date approaches and forecasts become more certain, the market price should converge with mainstream meteorological predictions.