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When calculating pressure increase in relationship to temp we convert to kelvin not Fahrenheit. Doubling temperature from 30 to 60 deg Fahrenheit is only a 5.8% increase when converted to Kelvin. So, your pressure increase would only be 5.8% not double. A 100psi tank stored in a place that goes from 30deg F to 60F would be raised to approx 106psi... which is why it is safe to keep tires on your car(they won't explode when the temp doubles in deg F) or an air storage tank in your garage where ambient temps are very unstable.