Official National Weather Service observations recorded a minimum temperature of 61°F in Denver on September 17, 2026, aligning closely with the market's dominant 62-63°F outcome at 95% implied probability. This reading occurred around dawn under typical late-summer conditions featuring clear to partly cloudy skies, light southwesterly winds, and no significant precipitation or frontal passages that would drive sharper cooling. The value sits well above the 1991-2020 normal low of 49°F and far from historical September extremes, reflecting stable high-pressure influence and seasonal warmth that limited radiational cooling overnight. Trader consensus reflects this verified station data from Denver International Airport and supporting sites, with limited scope for revision unless post-processing adjustments or alternative station readings emerge before final market settlement.