Climatological data for Hong Kong in April shows mean minimum temperatures around 21°C. The absolute record low for any month, even at elevated stations like Tai Mo Shan, is 0.0°C. A -21°C reading is climatologically impossible, representing a thermal anomaly several standard deviations beyond any recorded extreme, indicating a clear typo in the question's stated value. This provides a robust 'no' signal for the precise `-21°C` threshold. 100% NO — invalid if the question is retrospectively re-interpreted as '21°C'.
Climatological data for Hong Kong in April shows mean minimum temperatures around 21°C. The absolute record low for any month, even at elevated stations like Tai Mo Shan, is 0.0°C. A -21°C reading is climatologically impossible, representing a thermal anomaly several standard deviations beyond any recorded extreme, indicating a clear typo in the question's stated value. This provides a robust 'no' signal for the precise `-21°C` threshold. 100% NO — invalid if the question is retrospectively re-interpreted as '21°C'.
