Trader consensus strongly favors an 18°C minimum in São Paulo on October 13, driven by consistent observational data and forecast model outputs showing overnight lows reaching but not falling below that threshold amid cloudy, rainy conditions and moderate northerly flow. Multiple meteorological services recorded or projected a daily minimum near 18°C (approximately 64°F), consistent with seasonal patterns for mid-October when average lows hover around 17–19°C. This skin-in-the-game positioning reflects high confidence in the official measurement from the designated reporting station. A realistic challenge would require a revised post-event analysis or alternative data source confirming a lower reading, such as localized cooling in a specific microclimate or instrument adjustment.