Official observations from the Turkish State Meteorological Service and Esenboğa Airport station confirm Ankara's highest temperature on April 16 reached exactly 21°C, driving the market's 100% implied probability on this outcome amid partly cloudy skies and light winds. This aligns with a sharp warming rebound—April 14 highs near 18°C escalated following early-month cool spells of 9–15°C—consistent with ECMWF and GFS model consensus projecting mid-20s peaks that materialized modestly. Mid-April climatology supports such highs around 17–18°C on average, with no significant deviations noted. Scenarios challenging this would require rare post hoc data revisions from authoritative sources, though final measurements are typically binding for resolution.