Official observations from the Turkish State Meteorological Service (MGM) and international weather archives confirm Ankara's highest temperature on April 14 reached exactly 17°C, based on calibrated thermometer readings from Esenboğa Airport and city-center stations, aligning with automated surface weather data. This precise match to the market's resolution criteria—verified within 48 hours of the event—has driven trader consensus to 100% implied probability for 17°C, reflecting the reliability of MGM's real-time monitoring network amid typical mid-April conditions of mild continental air masses. Scenarios that could challenge this include rare data audits revealing sensor calibration errors or post hoc revisions from quality control, though such corrections occur in under 1% of routine daily records historically. Traders await any final MGM bulletin, expected by April 17.