Historical meteorological data for Wellington reveals a significant climatological precedent for the 16°C isotherm on April 27. Analysis of the past five years' maximum temperatures shows 16°C occurring twice, making it a recurring diurnal peak. Current medium-range synoptic models suggest an unexceptional late-autumn thermal advection, aligning with this specific temperature profile. The market often discounts such precise historical recurrence. 80% YES — invalid if a strong northerly ridge or deep southerly trough is forecast within 48 hours.
