Yeah it was my first experience with that high of a normal idle too. I could maybe record the noise mine makes but it' not real loud, not sure if the camera would pick it up well, I'll see. I do feel it as well, all sounds normal to me.

And yes I'm north of Detroit, where we're finally getting some warmer weather (55-60°F) but it's pretty windy. It was already 80°F before today last year.