The near-certain 99.5% market-implied odds for a 72–73 °F high on June 17 reflect official observations from Seattle-Tacoma International Airport (KSEA), the standard resolution source, which recorded that exact peak under partly cloudy skies and light northerly flow. Recent model guidance and surface analyses confirmed a modest marine influence moderating temperatures below the broader Pacific Northwest heat anomaly, keeping readings near the long-term June average rather than the upper-80s values initially projected earlier in the month. Minor probability remains on adjacent bins only because of potential station calibration differences or rounding conventions, yet post-event verification has left virtually no realistic pathway for those outcomes to resolve the market.