This prediction market focuses on forecasting the maximum temperature recorded at Incheon International Airport Station in Seoul, South Korea, on March 26, 2026. The market resolves based on data from Wunderground's historical weather archive for the RKSI station, which is the official weather observation point for Incheon International Airport. Participants are essentially betting on which temperature range will contain the day's peak Celsius reading, making it a specific test of meteorological prediction skill for a single location and date. Interest in such markets stems from both meteorological enthusiasts tracking seasonal patterns and speculative traders analyzing climate data trends. The outcome provides a measurable data point in the study of Seoul's spring climate variability. March weather in Seoul is notoriously transitional, with conditions that can swing rapidly between late-winter chills and early-spring warmth, influenced by continental air masses and the retreat of the Siberian High. This inherent variability makes precise single-day forecasts challenging months in advance, creating the uncertainty that drives prediction market activity. The market uses Incheon International Airport's data because it is a major, World Meteorological Organization-standardized observation site whose records are widely accepted for official purposes. Accurate long-range forecasts have significant implications for agriculture, energy demand planning, and public event scheduling in the Seoul Capital Area, home to over 25 million people.

Historical Context

Systematic weather observation in the Seoul area began in earnest during the 20th century. The official Seoul meteorological observatory started continuous records in 1907, though the location for official measurements has changed several times. Incheon International Airport's weather station (RKSI) became a primary reference point after the airport's opening in 2001, providing a modern, standardized dataset. Historically, March in Seoul marks a sharp transition. Average daily high temperatures climb from around 6°C at the start of the month to 12°C by the end, but the record books show this shift is not smooth. The highest temperature ever recorded in Seoul in March was 23.6°C on March 31, 1990. Conversely, March can still produce cold snaps, with sub-zero minimums possible. The variability on March 26 specifically demonstrates this range. In recent years, the highest temperature on this date was 18.5°C in 2021, while in 2018 it was a cooler 10.2°C. This 8-degree difference in recent history underlines the forecasting challenge. Long-term climate trends add another layer. South Korea has experienced a warming rate of approximately 1.2°C per century, with spring temperatures rising notably. This trend suggests a gradual upward shift in the probability distribution for March highs over time, though daily weather remains dominated by short-term atmospheric patterns.

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