It has been a heat wave that has given pause to many Phoenix residents, even to summer-tested veterans like Shields, who says he's been avoiding news reports about it. Despite the trend toward more very hot days, Phoenix residents have tended to shrug off the heat, he said. Heat can affect health, leading to exhaustion, dizziness, thirst or the more serious heatstroke, when the body's core temperature goes above 105 degrees F (40 degrees C). "This is not your typical summer heat." Asphalt temperatures can reach 160 degrees F (71 C) in the summer, the Arizona Humane Society wrote on its blog.