Recent observational data from London-area stations, including Heathrow, confirm a minimum temperature of 12°C on October 12, 2026, under mild, overcast conditions with southerly flow and high humidity near 90% that limited nocturnal radiative cooling. This aligns with regional model analyses showing limited diurnal range and above-average lows for mid-October, driving the market's near-certain consensus on the 12°C outcome. Resolution hinges on official verified readings; potential challenges include minor station-to-station variations, timing of the absolute low, or any post-event data revisions from the Met Office or equivalent authorities.