Official National Weather Service observations recorded a maximum of 90°F at Denver International Airport on September 7, 2026, aligning precisely with the market's dominant 90-91°F outcome. This value exceeded the 1991-2020 climatological normal of 83°F by seven degrees under clear, dry conditions with light winds, consistent with late-summer high-pressure dominance and no significant frontal passages. The 100% market-implied probability reflects traders' confidence in verified station data, which undergoes quality control before finalization. Minor revisions remain possible only through post-processing adjustments or station instrumentation discrepancies, though such changes rarely exceed one degree for this site.