Official meteorological observations from Environment Canada stations in the Toronto area recorded a daily maximum temperature of 19°C on October 2, driving the market's near-certain consensus on that outcome. This aligns with surface data from primary reporting sites, including Pearson International Airport, where thermometer readings and quality-controlled records established the peak under stable autumn conditions with minimal diurnal variation. Model analyses and historical climatology for early October in southern Ontario further corroborate the measurement, as no anomalous warm or cold advection altered the expected range. While rare post-processing revisions or station-specific discrepancies could theoretically shift the final certified value, the multi-station agreement and absence of conflicting reports make such adjustments highly improbable.