I don't think your temperature differences are enough to worry about either way, though if it's a choice between a warm low humidity place, and a cold damp garage the warm place is better. Often bikes kept damp full time rust faster, and the aluminum can darken or develop what look like white mildew (it's not) looking oxidation damage.
Bikes that face larger temp swings, especially if the warm place is more humid are prone to damage via water condensation inside the frame. This was and is a common problem for year round riders of high quality steel bikes, and why products like Frame Saver are sold.
If you have a garden shed, or a friend who has one, take a look at the metal tools stored there, and see how they're doing.
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