**Trader consensus on 5°C or below for Ankara's lowest temperature on October 11 stems from verified overnight observations and model runs showing strong radiational cooling under clear, dry conditions.** With low humidity, light winds, and minimal cloud cover, surface temperatures dropped efficiently after sunset, consistent with late-autumn patterns in the Anatolian plateau. Official stations typically record the daily minimum near dawn, and current data align with or below the 5°C threshold. While ensemble forecasts carry some uncertainty from local microclimates, the overwhelming market-implied probability reflects high confidence in the final official reading, with only remote scenarios like measurement revisions or unforecasted warming able to alter the outcome.