Official Met Office observations from London City Airport confirm the highest temperature on May 14 reached exactly 12°C, driving trader consensus to 100% on that outcome as the market resolves. This positioning stems from a cool northerly airflow ushering in an unstable air mass with frequent showers, hail, and brisk winds that capped daytime highs well below the mid-May climatological average of 17–18°C at the station. Forecast models from the UK Met Office had anticipated these conditions 24–48 hours prior, aligning with observed cloud cover and precipitation suppressing solar heating. While post-resolution data revisions are exceedingly rare for verified station measurements, a hypothetical audit revealing sensor malfunction or quality-control anomaly could prompt reevaluation, though historical precedents show such events occur in under 0.1% of cases.