Mean mid-day (1200 to 1500 hr) surface temperatures of different ground surface types surrounding landscape trees at 15 commercial parking lots in Phoenix, Arizona, under seasonally normal, clear sky conditions during July to August 2002.
| Surface cover type | Temperature [°C (°F)] |
|---|---|
| Asphalt | 59.4 (138.9) a* |
| Concrete | 47.5 (117.5) b |
| Decomposing granite mulch | 44.1 (111.4) c |
| Turf | 32.8 (91.0) d |
↵*Means followed by the same letter are not significantly different, Duncan’s multiple range test, α = 0.05.