Official meteorological observations from the Met Office network across London recorded a daily maximum temperature of 15°C on May 16, with readings from central stations confirming no higher values amid stable high-pressure conditions and light winds that limited warming. This aligns with typical mid-May climatology for the region, where average highs hover near 16–17°C but cooler Atlantic air intrusions often cap peaks. Trader consensus at 100% for the 15°C outcome reflects the strength of these verified data points, though minor revisions could arise from final quality-controlled station adjustments or if an isolated urban heat-island effect at a secondary site briefly exceeded the threshold.