Here’s a look back at what happened in the Chicago area on Sept. 13, according to the Tribune’s archives.

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Weather records (from the National Weather Service, Chicago )

High temperature: 98 degrees (1939)

Low temperature: 39 degrees (1890)

Precipitation: 6.64 inches (2008)

Snowfall: None

1963: Firefighters and nuns worked quickly to evacuate 109 patients during an extra-alarm fire at the hospital, which destroyed the roof and the fourth floor of the building. A human chain of doctors, nurses and aides safely removed 29 newborn infants and their mothers from Mercy’s obstetrics ward.

Flashback: Mercy Hospital’s major milestones

Surgeries — including brain, abdominal and gallbladder operations and a tonsillectom

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