This prediction market focuses on forecasting the maximum temperature recorded at Seattle-Tacoma International Airport (SEA) on March 1, 2026. The market resolves based on data from Wunderground's historical records for the official weather station at the airport, which is the primary source for Seattle's climatological data. Participants are essentially betting on which temperature range will contain the official high for that specific date, a common type of climate derivative that links meteorological forecasting with financial speculation. The interest stems from the intersection of weather prediction accuracy, climate trend analysis, and the growing market for event-based contracts. Seattle's March weather is notoriously variable, sitting on the cusp of the transition from winter to spring in the Pacific Northwest, making single-day forecasts particularly challenging and subject to significant model uncertainty even a year in advance. This market serves as a public gauge of collective confidence in both seasonal forecasting and the potential influence of broader climate patterns, like El Niño or marine heatwaves, on a specific calendar day. Financial traders, climate scientists, and local businesses with weather-dependent operations all monitor such predictions, as they offer insights into expected conditions that can affect agriculture, energy demand, and tourism.

Historical Context

Seattle's climate is classified as temperate marine, characterized by mild, wet winters and dry summers. March sits within the tail end of the rainy season, but temperature extremes can occur due to shifts in atmospheric flow. The official weather records for Seattle have been kept at Sea-Tac Airport since 1945, providing a consistent 80-year dataset for analysis. Historically, March 1 temperatures have shown considerable variability. The all-time record high for March 1 at Sea-Tac is 67°F, set in 1992. In contrast, the record low maximum temperature for the date is 36°F, recorded in 1950. The 30-year climatological normal (1991-2020) for the daily high temperature on March 1 is approximately 52°F. This normal has increased over time, reflecting regional warming trends. Analysis by the Office of the Washington State Climatologist shows that average temperatures in the Puget Sound lowlands have risen by about 1.5°F since the mid-20th century, with a more pronounced warming trend in overnight lows. This long-term trend suggests a statistical increase in the probability of warmer-than-normal March days over time. However, individual days remain highly sensitive to short-term weather patterns, such as the position of the jet stream and whether offshore flow brings continental air from the east or maritime air from the Pacific.

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