Official meteorological observations from London stations, including hourly data from London City Airport, recorded a minimum temperature of 9°C on October 11, 2026, during early morning hours under stable high-pressure conditions with light southwesterly winds. This aligns with broader regional patterns showing overnight radiative cooling under clear to partly cloudy skies, consistent with late-autumn climatology where daily lows typically range 8–10°C. Trader consensus at 100% for 9°C reflects verified post-event measurements rather than forecasts, locking in the outcome. Revisions to official records from primary sources like the Met Office or discrepancies in station-specific readings could theoretically alter resolution, though such adjustments remain rare after initial quality control.