[tyingq]

I think you're right. Average annual high temp in Dallas is 77 degrees F. It's 64 for San Francisco. Obviously would need more analysis, but there's certainly much difference between the two northernmost significant cities. Though the article cites mostly industrial use as the difference.

[positr0n]

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°.

[tyingq]

The 13 degree spread was the interesting part, but only as a quick indicator, not real comparison or analysis.