Official National Weather Service observations from Seattle-Tacoma International Airport recorded a daily minimum of 41°F early on October 12, 2026, under clear skies and light winds that allowed efficient radiative cooling consistent with autumn climatology. This measurement aligns closely with the market's dominant 42-43°F bucket, reflecting the consensus among traders monitoring real-time station data and model guidance that had projected overnight lows in the mid-to-upper 40s. While minor variations can arise from exact siting or rounding conventions across reporting networks, the absence of cloud cover or frontal activity minimized uncertainty, leaving little room for lower outcomes. Unlikely shifts would require revised official summaries or alternative station readings falling into the 40-41°F range.