Answer is: the average net change in temperature is 4°C.
the average net change = the average high - the average low.
the average net change = -6°C - (-10°C).
the average net change = 4°C.
Temperature is the intensity of heat present in a substance and a thermometer is a device that measures temperature or a temperature gradient.
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.