SANTIAGO, Chile Less than 100th of an inch of rain fell on the Chilean port city of Iquique on Monday afternoon. That was enough to knock out power to several neighborhoods and to damage the roofs of 4,000 precarious dwellings, Gov. Miguel Silva said Tuesday.

Schools were closed Tuesday so that officials can repair the damage. There were no reports anyone was injured.

The city of 170,000 people in northern Chile is in the heart of the barren Atacama Desert, squeezed between the Andes and the Pacific Ocean. It averages about 0.02 inch (0.6 millimeter) of rain a year, according to University of Chile meteorologists.

Roofs in this region are to protect people from the sun, not from rain, Silva said.

With little water to worry about, many of Iquiques poor live in homes covered with a bits of wood, plaster or even cardboard that are easily damaged by a little rain and wind. Many have no slope to let water run off.