She was questioning her move this week as the temperature hit 110 degrees for an 11th straight day on Monday, with no end in sight. Ms. Williams wore long sleeves, black gloves and a broad-brimmed visor with flaps covering her neck to deflect the sun as she walked her route. But no matter how much water or electrolyte solution she drank, her legs tingled and her head spun. “I don’t even know how I do it,” Ms. Williams, 35, said. Summers in Phoenix are now a brutal endurance match.

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Persons: Rachelle Williams, Williams, Ms, Summers Locations: Indiana, Arizona, Phoenix