Official temperature observations from National Weather Service stations in Austin on October 12 confirmed a daily maximum of 90–91°F, aligning with the market’s near-certain outcome. Post-event data verification, including hourly readings and quality-controlled summaries, eliminated forecast uncertainty once the calendar day closed. Model guidance from the prior week had pointed to a warm, dry air mass under high pressure, producing conditions consistent with this narrow range rather than broader seasonal norms. Any realistic shift would require an official record revision from the primary reporting station or a change in the market’s defined resolution source, both of which remain rare after initial publication.