A team of construction workers is pouring concrete onto the frame of a structure that will eventually become a wastewater treatment plant. It's 1 a.m. on a clear night in the suburbs of Phoenix.
The temperature is still in the high 80s. But that's way down from the area's recent record high temperatures, up to 118 degrees.
Around here, it never really gets cool in the summer. That's partly because Phoenix is such a big city that it traps the heat — a heat island.
But now in the middle of the night, it's finally cool enough to start work.