Wellington's climatological mean maximum temperature for late April is 16.6°C. The 14°C threshold implies a significant negative thermal anomaly. Without strong synoptic indicators for prolonged cold advection or persistent low cloud cover in long-range models, the probability of the daily high remaining at or below this level is low. Historical thermal profiles and mean reversion bias strongly favor a higher peak temperature. [80]% NO — invalid if a persistent deep southerly flow with heavy precipitation is forecast within 48h of event.
