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People sit on a bench during an autumn day in Lincoln Park on Sept. 23, 1981, in Chicago.
People sit on a bench during an autumn day in Lincoln Park on Sept. 23, 1981, in Chicago.
A couple walks on Oak Street Beach in Chicago during a fall day in September 1976 at Lake Michigan.
A couple walks on Oak Street Beach in Chicago during a fall day in September 1976 at Lake Michigan.
Two boys were among the more than 220,000 students participating in the Freedom Day school boycott on Oct. 22, 1963, in Chicago. They used their time to rake up and burn leaves in the front yard of their South Side home.
Two boys were among the more than 220,000 students participating in the Freedom Day school boycott on Oct. 22, 1963, in Chicago. They used their time to rake up and burn leaves in the front yard of their South Side home.
A bicyclist is caught up in his thoughts as the fall season surrounds him in Lincoln Park on Sept. 22, 1982, in Chicago.
A bicyclist is caught up in his thoughts as the fall season surrounds him in Lincoln Park on Sept. 22, 1982, in Chicago.
Meg Nickle, left, adds a leaf to a bagful gathered by her mother, Sue Nickle, who plans to use the leaves in a compost heap for fertilizer in Lincoln Park, circa October 1972.
Meg Nickle, left, adds a leaf to a bagful gathered by her mother, Sue Nickle, who plans to use the leaves in a compost heap for fertilizer in Lincoln Park, circa October 1972.
Louis Rosio and his daughter, Sandra, 4, sit and look out over the boats at Burnham Harbor on Sept. 21, 1982, in Chicago.
Louis Rosio and his daughter, Sandra, 4, sit and look out over the boats at Burnham Harbor on Sept. 21, 1982, in Chicago.
Jogging paths in Lincoln Park are especially appealing on a brisk autumnal morning after the rain on Sept. 22, 1982, in Chicago.
Jogging paths in Lincoln Park are especially appealing on a brisk autumnal morning after the rain on Sept. 22, 1982, in Chicago.
A boy holds his free pumpkin in the Winston Hills community in Woodridge in October 1966.
A boy holds his free pumpkin in the Winston Hills community in Woodridge in October 1966.
Tom Graziano sweeps up leaves along a sidewalk on Mohawk Street on the North Side, a sure sign that fall is here and winter is not far off, on Oct. 14, 1982, in Chicago.
Tom Graziano sweeps up leaves along a sidewalk on Mohawk Street on the North Side, a sure sign that fall is here and winter is not far off, on Oct. 14, 1982, in Chicago.
A few weeks ago, it was bikini weather on North Avenue Beach in Chicago. Now, a couple of joggers wear sweaters as they run past piles of fallen leaves on Oct. 1, 1973.
A few weeks ago, it was bikini weather on North Avenue Beach in Chicago. Now, a couple of joggers wear sweaters as they run past piles of fallen leaves on Oct. 1, 1973.
Piles of colorful fall leaves mean piles of fun for preschoolers and kindergartners from St. Luke's Lutheran School in suburban Montgomery on a recent trip to Red Oak Nature Center in North Aurora on Oct. 13, 1989.
Piles of colorful fall leaves mean piles of fun for preschoolers and kindergartners from St. Luke’s Lutheran School in suburban Montgomery on a recent trip to Red Oak Nature Center in North Aurora on Oct. 13, 1989.
Mrs. Ben Spurr is lost in a cloud of smoke from burning leaves in Maywood on Oct. 8, 1963.
Mrs. Ben Spurr is lost in a cloud of smoke from burning leaves in Maywood on Oct. 8, 1963.
Pausing under a fruit-ladden apple tree, a hiker romps with his dog on Oct. 9, 1962.
Pausing under a fruit-ladden apple tree, a hiker romps with his dog on Oct. 9, 1962.
In the fall, milkweed seeds pop from pods, like these in Thatcher Woods in River Forest, Oct. 27, 1971.
In the fall, milkweed seeds pop from pods, like these in Thatcher Woods in River Forest, Oct. 27, 1971.
Steven Katt pours Champagne for Terry Strunck on Oct. 28, 1983, as they enjoy a view of the last remaining sailboats anchored in Burnham Harbor on a perfect fall afternoon.
Steven Katt pours Champagne for Terry Strunck on Oct. 28, 1983, as they enjoy a view of the last remaining sailboats anchored in Burnham Harbor on a perfect fall afternoon.
Leaves that are beautiful to many are an obstacle for Nancy Granda, 14 months, as she tries to move her walker along the sidewalk on Oct. 22, 1986, in the 3500 block of Wood Street in Chicago.
Leaves that are beautiful to many are an obstacle for Nancy Granda, 14 months, as she tries to move her walker along the sidewalk on Oct. 22, 1986, in the 3500 block of Wood Street in Chicago.
Cyclists and strollers move through a sunlight-dappled forest strewn with fallen leaves on Oct. 10, 1982.
Cyclists and strollers move through a sunlight-dappled forest strewn with fallen leaves on Oct. 10, 1982.
The Chicago skyline can be seen through leaves at Montrose Harbor on Sept. 22, 1982.
The Chicago skyline can be seen through leaves at Montrose Harbor on Sept. 22, 1982.