Official meteorological observations from Environment Canada and Toronto's principal weather stations, including Toronto Pearson International Airport, confirm the highest temperature on April 28 reached exactly 17°C, aligning with trader consensus at virtually 100% implied probability for that outcome. This positioning stems from real-time data logged during a mild spring day under partly cloudy skies with light winds, consistent with recent forecast models from the Canadian Meteorological Centre showing daytime highs in the mid-teens Celsius amid lingering cool continental air masses. Such verified station measurements carry authoritative weight for market resolution, with negligible risk of revision barring an unprecedented data error—scenarios like instrument malfunction or post-audit discrepancies occur in under 0.1% of cases historically. No further updates expected as records finalize.