I used to live in Tucson and took these measurements some
years ago. I know it's not black anodized aluminum but it
is some quantified data. All measurements were made on
surfaces in full sun except where noted. A thermocouple was
placed on the surface and covered with a 12x12x1" piece
of styrofoam. The measurement was recorded when the
reading stabilized. The grass was watered the previous evening.
Art

Tucson temperatures 25July96 2PM
Air 109F
Tap Water (cold) 80F
Grass 106F
Grass, full shade 82F
Swimming pool cool deck 125F
Concrete sidewalk, light grey 163F
Dirt, bare (light tan color) 158F
Roof, flat (silver paint) 145F
Asphalt, medium grey color (seal coated) 176F