To find the change in air temperature over the three hours, you can subtract the initial temperature from the final temperature. The initial air temperature is -5.5 degrees Fahrenheit, and the final air temperature at noon is -1.6 degrees Fahrenheit.
Change in temperature = Final temperature - Initial temperature
Change in temperature = (-1.6) - (-5.5)
Change in temperature = -1.6 + 5.5
Change in temperature = 3.9 degrees Fahrenheit
The change in air temperature over those three hours is an increase of 3.9 degrees Fahrenheit.