Official National Weather Service observations for Denver on October 1, 2026, recorded a daily maximum of 70°F under clear skies and light southerly winds, aligning closely with the market's dominant 68-69°F outcome. This value fell within the typical early-October range near the 1991-2020 normal high of 72°F, with no significant frontal passages or moisture to drive deviations. The 100% market-implied odds reflect trader confidence in the verified climatological report from Denver/Boulder NWS, which serves as the authoritative resolution source. Unlikely challenges include post-observation data revisions from the primary station or disputes over exact timing of the peak reading, though such adjustments rarely exceed 1-2°F.