Official measurements from Environment and Climate Change Canada at Toronto International Airport recorded a daily maximum of 23.3°C on October 7, 2026, with hourly peaks reaching 23°C amid partly cloudy skies, light showers, and southwest winds. This directly aligns with the market's 100% implied probability on 23°C, as traders incorporated the verified observation from the primary monitoring station rather than forecasts. Historical October 7 averages hover near 17°C, making the day's warmth notable but consistent with recent model trends showing mild conditions. Resolution hinges on the official daily high; minor discrepancies across stations or rounding conventions represent the only realistic challenges, though data consistency across sources supports the current consensus.