This prediction market focuses on forecasting the maximum temperature recorded at Tokyo Haneda Airport on March 26, 2026. The market resolves based on data from Weather Underground's historical records for the RJTT station, which is the official meteorological observation point for Tokyo's primary international airport. Participants are essentially betting on which temperature range will contain the day's peak Celsius reading, a specific metric of short-term weather within Tokyo's broader climate patterns. The interest stems from combining meteorological forecasting with financial speculation, creating a measurable test of predictive accuracy against official weather station data. Tokyo's weather in late March is particularly variable as the city transitions from winter to spring, making temperature predictions challenging and creating active debate among forecasters. The market provides a concrete, time-bound event where various forecasting models, from professional meteorological services to amateur analyses, can be directly compared and evaluated. This specific date in 2026 is far enough in the future to be uncertain, yet close enough for seasonal climate patterns to offer some predictive basis, attracting participants interested in climate science, data analysis, and prediction markets. The use of Haneda Airport's official data ensures a standardized, verifiable resolution source that is widely accepted in meteorological reporting.

Historical Context

Tokyo's climate records provide essential context for predicting a single day's high temperature. The city has a humid subtropical climate with distinct seasonal shifts. March historically marks the end of winter, with average high temperatures at Haneda Airport rising from about 12°C in early March to near 15°C by month's end. However, significant variability exists. The highest temperature ever recorded in Tokyo during March was 25.8°C on March 26, 1990, at the former Tokyo Meteorological Observatory site. More recently, on March 26, 2021, Haneda Airport recorded a high of 18.5°C. In contrast, March 26, 2020, saw a cooler high of 13.2°C. This nearly 13-degree historical range for the same calendar date illustrates the forecasting challenge. The year 2026 adds another layer, as it falls within a potential El Niño or La Niña phase of the El Niño–Southern Oscillation, a climate pattern that significantly influences winter and spring temperatures across East Asia. Past strong El Niño events, like in 2015-2016, have been associated with warmer-than-average spring conditions in Japan. Tokyo's documented urban heat island effect, which has increased average temperatures by approximately 3°C over the last century, also provides a long-term warming trend that participants must factor into their predictions.

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