Answer is: high temperature.
The Celsius scale, also known as the centigrade scale, is a temperature scale used by the International System of Units (SI).
The Celsius scale was based on 0°C for the freezing point of water and 100°C for the boiling point of water at 1 atm pressure.
The degree Fahrenheit (symbol: °F) is not used by the International System of Units.
In the Fahrenheit scale, water freezes at 32 degrees, and boils at 212 degrees.
The temperature T in degrees Celsius (°C) is equal to the temperature T in degrees Fahrenheit (°F) minus 32, times 5/9: T(°C) = (T(°F) - 32) × 5/9.