You really can't average a wide area though, parking is a highly localized and cyclical problem set. During the night, most people will be at home, and during

You really can't average a wide area though, parking is a highly localized and cyclical problem set. During the night, most people will be at home, and during the day, most people will be at work. Your city will increase in population during the day as commuters from the suburbs commute to work. Events will happen in your city which will cause huge outliers in the demand for spaces.