From To Kill a Mockingbird:

Maycomb was an old town, but it was a tired old town when I first knew it.  In rainy weather the streets turned to red slop; grass grew on the sidewalks, the courthouse sagged in the square.  Somehow, it was hotter then: a black dog suffered on a summer's day; bony mules hitched to Hoover carts flicked flies in the sweltering shade of the live oaks on the square. Men's stiff collars wilted by nine in the morning.  Ladies bathed before noon, after their three o'clock naps, and by nightfall were like soft teacakes with frostings of sweat and sweet talcum.

People moved slowly then.  They ambled across the square, shuffled in and out of the stores around it, took their time about everything.  A day was twenty-four hours long but seemed longer.

The author has created a mood or atmosphere that is sultry and languid.  The reader can actually feel the humidity and the listlessness of a hot Southern day in Alabama.