Is average annual high a useful measure here? When the high is around 77° during those amazing couple of weeks in March and October in I never have to turn on t

Is average annual high a useful measure here? When the high is around 77° during those amazing couple of weeks in March and October in I never have to turn on the heat or AC. The AC is running all day in July and August though; especially the 50% of days hotter than the average high of 95°.