On December 24, 1924, the temperature in Fairfield, Montana, fell from 63F at noon to -21F at midnight. What was the average temperature change per hour?

Average temperature change can be found through the equation
Avg Temp change per hour=Total temperature change ÷ Total time
=84÷12
=7
Since the temperature was decreasing, make the 7 negative -7
Hope this helps!