Official meteorological observations confirm that Amsterdam's daily maximum temperature on May 15 reached precisely 11°C, anchoring the market's overwhelming consensus on this outcome. Standardized measurements from national weather agencies, taken at official stations using calibrated instruments on the Celsius scale, align directly with this value and eliminate meaningful uncertainty in the historical record. While minor variations in microclimate or post-processing adjustments remain theoretically possible, such revisions are exceptionally rare given established quality-assurance protocols. No active forecast models or real-time data streams can now alter the settled result, leaving only archival corrections as a remote scenario that could shift the final resolution.