Hi,
I cannot reproduce your problem. Are you on Mathematica online? On my desktop and on Mathematica online the following
data = AirTemperatureData[Entity["City", {"Spokane", "Washington", "UnitedStates"}], {DateObject[{2016, 3, 1}], DateObject[{2016, 3, 30}]}]
works fine and downloads hourly data.
Cheers,
Marco