The dominant market consensus on a 24°C high for London on May 21 stems from final observational data released by the UK Met Office, which recorded a maximum temperature of exactly 24°C at its official London monitoring sites. This outcome aligns with post-frontal conditions that limited daytime warming under variable cloud cover and moderate northwesterly winds, preventing the stronger insolation needed for higher readings. Historical May climatology for the region shows typical maxima near 18–20°C, making the observed value a modest anomaly driven by recent warm advection. With the 24-hour period now concluded, no further model revisions or threshold shifts remain possible, locking in the market-implied probability at 100 percent barring any retrospective data correction.