This prediction market focuses on forecasting the maximum temperature recorded at Wellington International Airport on March 27, 2026. The market resolves based on data from Wunderground's historical records for the NZWN weather station, which is the official observation site for Wellington's climate data. Participants will predict which temperature range contains the day's highest recorded temperature in degrees Celsius. This specific forecast requires understanding Wellington's highly variable maritime climate, the influence of local topography on weather patterns, and the typical meteorological conditions for late March. Interest in this market stems from both meteorological enthusiasts tracking weather patterns and participants in prediction markets who analyze probabilistic outcomes based on climate data, historical trends, and seasonal forecasts. The accuracy of such predictions tests the ability to interpret complex local weather influences against broader climate patterns. Late March in Wellington represents the transition from summer to autumn, a period when temperature variability increases due to shifting wind patterns and the potential for both lingering warm spells and early cool changes. The market's resolution depends entirely on a single day's observation from an official station, making it a precise test of short-term climate forecasting within a specific geographic context.

Historical Context

Wellington's official temperature records at the airport station began in 1962, providing over 60 years of data for late March. Historically, March temperatures in Wellington show considerable variability due to the city's exposed position on Cook Strait. The highest temperature ever recorded in Wellington in any March was 28.3°C on March 8, 1994. For the specific date of March 27, historical extremes provide a narrower range. Over the past two decades, the maximum temperature on March 27 at the airport has ranged from a cool 14.2°C in 2008 to a warm 24.1°C in 2013. The long-term average maximum for late March is approximately 18.5°C. Significant weather events influencing March temperatures include ex-tropical cyclones moving south from the tropics, which can bring northerly winds and warmer conditions, and strong southerly outbreaks that can cause rapid cooling. The historical record shows that March 27 falls during a period when the average daily maximum temperature begins to decline from summer peaks, dropping about 3°C from early March to early April. Climate change has introduced a trend toward warmer background conditions, with NIWA data indicating New Zealand's annual average temperature has increased by 1.1°C since 1909, affecting the probability of warmer late-summer days.

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