Current MetService and international model ensembles, including ECMWF and GFS, project Wellington's March 24 high temperature clustering tightly around 20-21°C, driving the near-even split in trader odds between these outcomes at nearly 30% each. This stems from a dominant high-pressure ridge fostering northerly winds that advect warmer subtropical air masses southward, elevating daytime maxima above the late-autumn climatological average of 19°C. Differentiating factors include model spread on sea-breeze intensification, which could cap peaks at 19°C via coastal cooling, versus sustained northerlies pushing toward 22°C; historical data shows March 24 variability of ±2°C tied to such synoptic nuances. Traders await the next 12-hour forecast update for refined guidance, with low odds on extremes reflecting high confidence in mild conditions.