Table 1. Average degree hours (September 2001 and June 2002) over 40°C (105°F) for rhizosphere temperatures [30 cm (12 in.) depth] at five locations along transect gradients that were perpendicular to the north-south orientation of a parking lot landscape median on the Arizona State University campus in Tempe, Arizona, from the landscape median center (0.0 m) in easterly or westerly directions to a distance of 7.62 m (25 ft).