Official measurements from National Weather Service stations, including Atlanta's primary airport site, recorded a daily maximum of 83°F on October 12 under clear skies and moderate northwest winds, consistent with high-pressure ridging that suppressed cloud cover and allowed strong daytime heating. This aligns precisely with the market's 82-83°F resolution range, as verified through preliminary climatological reports and multiple independent observations showing no higher readings. With post-event data now finalized, the 100% implied probability reflects near-certain confirmation from authoritative sources rather than forecasts. Only an unprecedented quality-control revision or station malfunction could alter the outcome, scenarios with negligible historical precedent for this location and date.